Fix misleading annotation in the documentation

[xadupre]

The function does not seem to work inplace in all cases.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.20%. Comparing base (288481d) to head (509e37d).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
onnxscript/tools/benchmark/benchmark_helpers.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2046      +/-   ##
==========================================
+ Coverage   71.76%   72.20%   +0.44%     
==========================================
  Files         225      216       -9     
  Lines       29275    28733     -542     
  Branches     3455     3412      -43     
==========================================
- Hits        21010    20748     -262     
+ Misses       7133     6862     -271     
+ Partials     1132     1123       -9     

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[justinchuby]

I updated the function signature to hide the proto related types. Users are discouraged to send in proto types but the logic is still there for now.