chore: more comments in injectForOrigin function

[TianaTuan]

Ⅰ. Describe what this PR does

add some comments in injectForOrigin Function

Ⅱ. Does this pull request fix one issue?

fixes #1251

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.17 🎉

Comparison is base (4a493a8) 64.90% compared to head (35f2673) 65.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1264      +/-   ##
==========================================
+ Coverage   64.90%   65.07%   +0.17%     
==========================================
  Files         312      312              
  Lines       32660    32661       +1     
==========================================
+ Hits        21197    21254      +57     
+ Misses       9910     9851      -59     
- Partials     1553     1556       +3     

Flag	Coverage Δ
unittests	65.07% <100.00%> (+0.17%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...oordlet/runtimehooks/protocol/container_context.go	32.14% <100.00%> (+27.35%)	⬆️

... and 4 files with indirect coverage changes

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[saintube]

@Tiana2018 The CI fails. Please check the DCO and sign-off the commit.

DCO
There is one commit incorrectly signed off. This means that the author of this commit failed to include a Signed-off-by line in the commit message.
To avoid having PRs blocked in the future, always include Signed-off-by: Author Name authoremail@example.com in every commit message. You can also do this automatically by using the -s flag (i.e., git commit -s).

[saintube]

This comment should be removed. The parameters below are legal.

[saintube]

please move the private pkg at the last

[saintube]

please left a blank line between functions

[TianaTuan]

Thank you for your suggestion.

[saintube]

/lgtm
PTAL @zwzhang0107

[jasonliu747]

/lgtm

[zwzhang0107]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zwzhang0107

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