fix: update the doc for Join function

[rohangujarathi]

Issue #, if available: #3778

Description of changes:

Doc fix

Testing done:

Merge Checklist

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• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: ba5ad22
• Result: SUCCEEDED
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• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: ba5ad22
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• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: ba5ad22
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• CodeBuild project: sagemaker-python-sdk-unit-tests
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[codecov-commenter]

Codecov Report

Merging #3807 (ba5ad22) into master (46215ae) will decrease coverage by 0.74%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3807      +/-   ##
==========================================
- Coverage   89.86%   89.13%   -0.74%     
==========================================
  Files        1056      246     -810     
  Lines      100852    24973   -75879     
==========================================
- Hits        90633    22259   -68374     
+ Misses      10219     2714    -7505     

Impacted Files	Coverage Δ
src/sagemaker/workflow/clarify_check_step.py	96.91% <ø> (ø)
src/sagemaker/workflow/functions.py	94.73% <ø> (ø)
src/sagemaker/clarify.py	97.36% <100.00%> (ø)

... and 1299 files with indirect coverage changes

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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: ba5ad22
• Result: SUCCEEDED
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