Fix docs for prost-reflect-build

[andrewhickman]

Fixes #132

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.88%. Comparing base (40bf30d) to head (eafacdd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
+ Coverage   79.75%   79.88%   +0.13%     
==========================================
  Files          31       31              
  Lines        5250     5250              
==========================================
+ Hits         4187     4194       +7     
+ Misses       1063     1056       -7     

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