docs(logger): new get_correlation_id method

[heitorlessa]

Issue #, if available: aws-powertools/powertools-lambda#23

Description of changes:

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #545 (c618d8f) into develop (cb0d54b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #545   +/-   ##
========================================
  Coverage    99.86%   99.86%           
========================================
  Files          113      113           
  Lines         4483     4483           
  Branches       243      243           
========================================
  Hits          4477     4477           
  Misses           3        3           
  Partials         3        3           

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