Fix markdown heading formatting in release posts

_posts/2025-07-16-3.7.0-released.md

@@ -14,20 +14,20 @@ To update to the latest RubyGems you can run:
 To install RubyGems by hand see the [Download RubyGems][download] page.
 
 
-_### Security:_
+### Security:
 
 * Update vendored resolv to 0.6.2. Pull request
   [#8831](https://github.com/rubygems/rubygems/pull/8831) by hsbt
 
-_### Breaking changes:_
+### Breaking changes:
 
 * Stop generating binstubs with support for RubyGems before 2.6.2. Pull
   request [#8833](https://github.com/rubygems/rubygems/pull/8833) by
   deivid-rodriguez
 * Drop support for Ruby 3.1. Pull request
   [#8634](https://github.com/rubygems/rubygems/pull/8634) by segiddins
 
-_### Enhancements:_
+### Enhancements:
 
 * Update SPDX license list as of 2025-07-01. Pull request
   [#8829](https://github.com/rubygems/rubygems/pull/8829) by
@@ -45,7 +45,7 @@ _### Enhancements:_
   [#8584](https://github.com/rubygems/rubygems/pull/8584) by segiddins
 * Installs bundler 2.7.0 as a default gem.
 
-_### Bug fixes:_
+### Bug fixes:
 
 * Fix signing HEAD and date formatting in S3 signer. Pull request
   [#8763](https://github.com/rubygems/rubygems/pull/8763) by rye-stripe
@@ -64,7 +64,7 @@ _### Bug fixes:_
 * Fix `--prerelease` flag to `gem install` sometimes not respected. Pull
   request [#8648](https://github.com/rubygems/rubygems/pull/8648) by ntl
 
-_### Documentation:_
+### Documentation:
 
 * Fix incorrect UPGRADING link in README.md. Pull request
   [#8838](https://github.com/rubygems/rubygems/pull/8838) by djbender

_posts/2025-07-21-3.7.1-released.md

@@ -14,7 +14,7 @@ To update to the latest RubyGems you can run:
 To install RubyGems by hand see the [Download RubyGems][download] page.
 
 
-_### Enhancements:_
+### Enhancements:
 
 * Fix regression in presence of RVM gems. Pull request
   [#8854](https://github.com/rubygems/rubygems/pull/8854) by
@@ -24,7 +24,7 @@ _### Enhancements:_
   deivid-rodriguez
 * Installs bundler 2.7.1 as a default gem.
 
-_### Documentation:_
+### Documentation:
 
 * Use mailto link in Code of Conduct. Pull request
   [#8849](https://github.com/rubygems/rubygems/pull/8849) by

_posts/2025-09-09-3.7.2-released.md

@@ -14,7 +14,7 @@ To update to the latest RubyGems you can run:
 To install RubyGems by hand see the [Download RubyGems][download] page.
 
 
-_### Enhancements:_
+### Enhancements:
 
 * `gem sources --prepend` and `--append` allow finer grained control of
   sources. Pull request
@@ -30,7 +30,7 @@ _### Enhancements:_
   folbricht-stripe
 * Installs bundler 2.7.2 as a default gem.
 
-_### Bug fixes:_
+### Bug fixes:
 
 * Fix "did you mean" suggestions for unknown commands. Pull request
   [#8948](https://github.com/rubygems/rubygems/pull/8948) by

_posts/2025-11-20-4.0.0.beta1-released.md

@@ -14,12 +14,12 @@ To update to the latest RubyGems you can run:
 To install RubyGems by hand see the [Download RubyGems][download] page.
 
 
-_### Security:_
+### Security:
 
 * Bump up vendored URI to 1.0.4. Pull request
   [#9031](https://github.com/ruby/rubygems/pull/9031) by hsbt
 
-_### Breaking changes:_
+### Breaking changes:
 
 * Removed deprecated `-C` option from gem build. Pull request
   [#9088](https://github.com/ruby/rubygems/pull/9088) by hsbt
@@ -40,12 +40,12 @@ _### Breaking changes:_
 * Removed `compatibility.rb` for RG 4.0. Pull request
   [#8899](https://github.com/ruby/rubygems/pull/8899) by hsbt
 
-_### Deprecations:_
+### Deprecations:
 
 * Deprecate `Gem::Specification#datadir`. Pull request
   [#8900](https://github.com/ruby/rubygems/pull/8900) by hsbt
 
-_### Features:_
+### Features:
 
 * Undeprecate `Gem::Version.new(nil)`. Pull request
   [#9086](https://github.com/ruby/rubygems/pull/9086) by tenderlove
@@ -54,7 +54,7 @@ _### Features:_
 * Add pattern matching support to Gem::Platform. Pull request
   [#9062](https://github.com/ruby/rubygems/pull/9062) by baweaver
 
-_### Performance:_
+### Performance:
 
 * Remove some memoization. Pull request
   [#9017](https://github.com/ruby/rubygems/pull/9017) by tenderlove
@@ -69,7 +69,7 @@ _### Performance:_
 * Use File#chmod rather than FileUtils.chmod. Pull request
   [#8965](https://github.com/ruby/rubygems/pull/8965) by tenderlove
 
-_### Enhancements:_
+### Enhancements:
 
 * Update all vendored libraries to latest version. Pull request
   [#9089](https://github.com/ruby/rubygems/pull/9089) by hsbt
@@ -95,7 +95,7 @@ _### Enhancements:_
   request [#8879](https://github.com/ruby/rubygems/pull/8879) by ioquatix
 * Installs bundler 4.0.0.beta1 as a default gem.
 
-_### Documentation:_
+### Documentation:
 
 * [DOC] Fix the location of Gem::Deprecate document. Pull request
   [#9065](https://github.com/ruby/rubygems/pull/9065) by nobu

_posts/2025-11-26-4.0.0.beta2-released.md

@@ -19,18 +19,18 @@ To update to the latest Bundler you can run:
 ## RubyGems Release Notes
 
 
-_### Deprecations:_
+### Deprecations:
 
 * Deprecate comparing Gem::Version objects with strings. Pull request
   [#9085](https://github.com/ruby/rubygems/pull/9085) by tenderlove
 
-_### Enhancements:_
+### Enhancements:
 
 * Undeprecate Gem::Version#<=> against strings. Pull request
   [#9110](https://github.com/ruby/rubygems/pull/9110) by byroot
 * Installs bundler 4.0.0.beta2 as a default gem.
 
-_### Bug fixes:_
+### Bug fixes:
 
 * Respect `BUNDLE_VERSION` config at Gem::BundlerVersionFinder. Pull
   request [#9106](https://github.com/ruby/rubygems/pull/9106) by hsbt
@@ -39,22 +39,22 @@ _### Bug fixes:_
 ## Bundler Release Notes
 
 
-_### Features:_
+### Features:
 
   - Support bundle install --lockfile option [#9111](https://github.com/ruby/rubygems/pull/9111)
   - Add support for lockfile in Gemfile and bundle install --no-lock [#9059](https://github.com/ruby/rubygems/pull/9059)
 
-_### Performance:_
+### Performance:
 
   - Run git operations in parallel to speed things up: [#9100](https://github.com/ruby/rubygems/pull/9100)
 
-_### Enhancements:_
+### Enhancements:
 
   - Fixup GH-9085 [#9108](https://github.com/ruby/rubygems/pull/9108)
   - Add go_gem/rake_task for Go native extention gem skeleton [#9105](https://github.com/ruby/rubygems/pull/9105)
   - Keep legacy windows platform, not removed them [#9104](https://github.com/ruby/rubygems/pull/9104)
 
-_### Bug fixes:_
+### Bug fixes:
 
   - Check for file existence before deletion from cache [#9095](https://github.com/ruby/rubygems/pull/9095)