documentation: add missing quotation mark

[stevenpitts]

Issue #, if available: None available

Description of changes: Add missing quotation mark

Testing done: no.

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[stevenpitts]

Looks like CodeBuild isn't gonna complete so I'm gonna mark this as ready

[knikure]

/bot run all

[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: a46c606
• Result: SUCCEEDED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: a46c606
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: a46c606
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: a46c606
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: a46c606
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[codecov-commenter]

Codecov Report

Merging #3916 (a46c606) into master (f1a809c) will decrease coverage by 0.71%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3916      +/-   ##
==========================================
- Coverage   90.08%   89.38%   -0.71%     
==========================================
  Files        1156      271     -885     
  Lines      106700    26378   -80322     
==========================================
- Hits        96121    23577   -72544     
+ Misses      10579     2801    -7778     

Impacted Files	Coverage Δ
src/sagemaker/model.py	93.86% <100.00%> (ø)

... and 1426 files with indirect coverage changes