fix property naming in the cognito event docs

[smartinspereira]

Description of changes:

• just fixed a small typo :)

Description of how you validated changes:

• you can see the correct property name in the line above

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #1331 into master will decrease coverage by 0.62%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1331      +/-   ##
==========================================
- Coverage    95.3%   94.67%   -0.63%     
==========================================
  Files          78       77       -1     
  Lines        5171     4129    -1042     
  Branches     1190      815     -375     
==========================================
- Hits         4928     3909    -1019     
+ Misses        113      108       -5     
+ Partials      130      112      -18

Impacted Files	Coverage Δ
samtranslator/swagger/swagger.py	92.57% <0%> (-2.91%)	⬇️
samtranslator/plugins/api/implicit_api_plugin.py	95.57% <0%> (-2.66%)	⬇️
samtranslator/plugins/exceptions.py	83.33% <0%> (-2.39%)	⬇️
samtranslator/model/eventsources/push.py	90.61% <0%> (-1.43%)	⬇️
samtranslator/plugins/globals/globals.py	99.02% <0%> (-0.98%)	⬇️
samtranslator/model/api/api_generator.py	96.72% <0%> (-0.92%)	⬇️
...el/preferences/deployment_preference_collection.py	91.13% <0%> (-0.91%)	⬇️
samtranslator/open_api/open_api.py	93.56% <0%> (-0.83%)	⬇️
samtranslator/model/apigateway.py	97.79% <0%> (-0.66%)	⬇️
samtranslator/translator/arn_generator.py	86.95% <0%> (-0.55%)	⬇️
... and 23 more

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[ShreyaGangishetty]

Looks like this is fixed in #1233 PR and merged into develop. Could you please pull and rebase the latest changes to see the change fixed?

[ShreyaGangishetty]

Closing this PR as this was fixed in #1233