Fix goword errors

[ivanvc]

For some reason, the goword check has passed while the file tests/integration/embed/embed_proxy_test.go has an error in the godoc. Update it so it doesn't show the error anymore.

Running goword against this file returns:

$ goword ./tests/integration/embed/embed_proxy_test.go
./tests/integration/embed/embed_proxy_test.go.17: // The purpose of this (empty) package is too keep following test working: (godoc-export: The -> // Package embed_test?)

I found this while working on another related task.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.86%. Comparing base (488f215) to head (c136d5a).
Report is 4 commits behind head on main.

Additional details and impacted files

see 26 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19310      +/-   ##
==========================================
+ Coverage   68.84%   68.86%   +0.02%     
==========================================
  Files         420      420              
  Lines       35693    35693              
==========================================
+ Hits        24572    24581       +9     
+ Misses       9705     9692      -13     
- Partials     1416     1420       +4     

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc

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