cleanup: address review comments

[coryan]

This PR addresses review comments after an automatic merge.

The auto-merge trapfeature was fully armed when @devjgm approved #340.

[codecov]

Codecov Report

Merging #341 (53259ce) into main (aae4eb9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #341   +/-   ##
=======================================
  Coverage   89.24%   89.24%           
=======================================
  Files          98       98           
  Lines        2733     2733           
=======================================
  Hits         2439     2439           
  Misses        294      294           

Impacted Files	Coverage Δ
examples/site/bearer_token/bearer_token.cc	82.14% <ø> (ø)
google/cloud/functions/http_request.h	100.00% <ø> (ø)
google/cloud/functions/http_response.h	100.00% <ø> (ø)

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