[DOC] Tweaks for String#unpack1

Author: BurdetteLamar

pack.rb

@@ -28,8 +28,10 @@ def unpack(fmt, offset: 0)
   # call-seq:
   #   unpack1(template, offset: 0) -> object
   #
-  #  Like String#unpack, but unpacks and returns only the first extracted object.
+  #  Like String#unpack with no block, but unpacks and returns only the first extracted object.
   #  See {Packed Data}[rdoc-ref:packed_data.rdoc].
+  #
+  #  Related: see {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].
   def unpack1(fmt, offset: 0)
     Primitive.pack_unpack1(fmt, offset)
   end