Nit fixes to doc and tests

[cijothomas]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.1%. Comparing base (c2a2b8d) to head (90bb59c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-sdk/src/metrics/mod.rs	94.4%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2626   +/-   ##
=====================================
  Coverage   79.1%   79.1%           
=====================================
  Files        119     119           
  Lines      22554   22556    +2     
=====================================
+ Hits       17846   17857   +11     
+ Misses      4708    4699    -9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.