docs: Add DELETE example for Route53 ChangeResourceRecordSets

[adev-code]

This commit adds a DELETE operation example to the Route53 ChangeResourceRecordSets documentation to address issue #4519.

Fixes #4519

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.05%. Comparing base (6300f6b) to head (aef7de6).
Report is 284 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3478      +/-   ##
===========================================
+ Coverage    92.94%   93.05%   +0.11%     
===========================================
  Files           66       67       +1     
  Lines        14956    15170     +214     
===========================================
+ Hits         13901    14117     +216     
+ Misses        1055     1053       -2     

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We should get this example added upstream before adding it to botocore