docs: improve code documentation- v1

[zazie-codes]

Make sure these boxes are signed before submitting your Pull Request -- thank you.

• [ x ] I have read the contributing guide lines at https://docs.suricata.io/en/latest/devguide/codebase/contributing/contribution-process.html
• [ x ] I have signed the Open Information Security Foundation contribution agreement at https://suricata.io/about/contribution-agreement/
• [ x ] I have updated the user guide (in doc/userguide/) to reflect the changes made (if applicable)

Link to redmine ticket:https://redmine.openinfosecfoundation.org/issues/6383

Describe changes:

• used standard documentation within C programming ;'commenting code' to add accurate file descriptions.
  -added accurate file descriptions to each C file excluding 'autoconf.h and app-layer-dcerpc-common.h' as they do not exist.
  -added file and author tag in the files to elaborate each file description maintaining consistency with the Suricata's documentation style.
  -Ensure there are no syntax errors and grammatical errors in the document maintaining existing format.

• ISSUE
  Ticket.6383

• Notes
  The file description added is in line with your existing documentation standards and will enhance the documentations accessibility.
  The additions are clear and concise.

I'll appreciate your feedback and guidance on how to improve the changes.

[github-actions]

NOTE: This PR may contain new authors:

Liza <oparliza@gmail.com>

[victorjulien]

Additionally, the commit message isn't properly formatted, and has no useful explanation of what the commit is about.

[codecov]

Codecov Report

Merging #9604 (686f893) into master (1a132f4) will increase coverage by 0.05%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9604      +/-   ##
==========================================
+ Coverage   82.28%   82.34%   +0.05%     
==========================================
  Files         968      968              
  Lines      274275   274275              
==========================================
+ Hits       225700   225861     +161     
+ Misses      48575    48414     -161     

Flag	Coverage Δ
fuzzcorpus	64.52% <ø> (+0.18%)	⬆️
suricata-verify	60.92% <ø> (-0.01%)	⬇️
unittests	62.87% <ø> (ø)

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