Fix changelog and few spell check issues

[cijothomas]

Global::Shutdown removal need to be noted in opentelemetry changelog too.
Fix few typos.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.1%. Comparing base (5b86b7f) to head (53a9b0c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...y-sdk/src/logs/log_processor_with_async_runtime.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2474   +/-   ##
=====================================
  Coverage   77.1%   77.1%           
=====================================
  Files        124     124           
  Lines      23021   23021           
=====================================
  Hits       17771   17771           
  Misses      5250    5250           

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