[Docs] Update IPC, shared memory, directory renaming in features.md

[kailun-qin]

Description of the changes

Fixes #2125, #2128 and #2110.

How to test this PR?

CI.

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This change is 

[mkow]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion

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-- commits line 2 at r1:

Suggestion:

[Docs] Update IPC, shared memory and directory renaming in features.md

[kailun-qin]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @mkow)

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-- commits line 2 at r1:
Done.

[mkow]

Reviewed all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[kailun-qin]

Jenkins, retest Jenkins-SGX-22.04-Sanitizers please (TCS limit exceeded in rlimit_nofile_4k, happens from time to time, unrelated to the PR)

[kailun-qin]

Jenkins, retest Jenkins-Direct-24.04 please (clearly unrelated to the PR)

Note that this failed pipeline showed the same (random) failure patterns (see https://localhost:8080/job/graphene-direct-24.04/243/console and the snippet below) as those observed in #1795, i.e., some issues already hidden in our current master branch. cc @mkow

23:24:43  ----------------------------- Captured stderr call -----------------------------
23:24:43  [0.483] [P1:libos] error: Internal memory fault at 0x4826b26c8990 (0x7fffffe306a3, VMID = 1, TID = 0)
23:24:43  - generated xml file: /home/jenkins/workspace/graphene-direct-24.04/libos/test/regression/libos-regression.xml -
23:24:43  =========================== short test summary info ============================
23:24:43  FAILED test_libos.py::TC_01_Bootstrap::test_201_exec_same - subprocess.CalledProcessError: Command '['/home/jenkins/workspace/graphene-direct-24.04/usr/lib/x86_64-linux-gnu/gramine/direct/loader', '/home/jenkins/workspace/graphene-direct-24.04/usr/lib/x86_64-linux-gnu/gramine/direct/libpal.so', 'init', 'exec_same', 'arg_#0', 'arg_#1', 'arg_#2', 'arg_#3', 'arg_#4', 'arg_#5', 'arg_#6', 'arg_#7', 'arg_#8', 'arg_#9', 'arg_#10', 'arg_#11', 'arg_#12', 'arg_#13', 'arg_#14', 'arg_#15', 'arg_#16', 'arg_#17', 'arg_#18', 'arg_#19', 'arg_#20', 'arg_#21', 'arg_#22', 'arg_#23', 'arg_#24', 'arg_#25', 'arg_#26', 'arg_#27', 'arg_#28', 'arg_#29', 'arg_#30', 'arg_#31', 'arg_#32', 'arg_#33', 'arg_#34', 'arg_#35', 'arg_#36', 'arg_#37', 'arg_#38', 'arg_#39', 'arg_#40', 'arg_#41', 'arg_#42', 'arg_#43', 'arg_#44', 'arg_#45', 'arg_#46', 'arg_#47', 'arg_#48', 'arg_#49']' returned non-zero exit status 1.