[AIRFLOW-XXX] Fix typo - AWS DynamoDB Hook

[SimonCW]

Description

• Fix typo correcting that the hook is for DynamoDB not Athena. Well, it is my second PR overall and I have the feeling I produce more work than benefit with changes like this? Feedback appreciated 🌵

[codecov-io]

Codecov Report

Merging #6319 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6319      +/-   ##
==========================================
- Coverage   80.35%   80.11%   -0.25%     
==========================================
  Files         616      616              
  Lines       35735    35735              
==========================================
- Hits        28716    28628      -88     
- Misses       7019     7107      +88

Impacted Files	Coverage Δ
airflow/contrib/hooks/aws_dynamodb_hook.py	91.3% <ø> (ø)	⬆️
airflow/operators/mysql_operator.py	0% <0%> (-100%)	⬇️
airflow/operators/mysql_to_hive.py	0% <0%> (-100%)	⬇️
airflow/utils/sqlalchemy.py	86.44% <0%> (-6.78%)	⬇️
airflow/jobs/local_task_job.py	86.25% <0%> (-3.75%)	⬇️
airflow/hooks/hive_hooks.py	75.82% <0%> (-1.79%)	⬇️
airflow/models/connection.py	63.88% <0%> (-1.12%)	⬇️
airflow/hooks/dbapi_hook.py	87.28% <0%> (-0.85%)	⬇️

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[mik-laj]

Every patch is helpful. This does not cause much work, because the review of these changes is quick. Changes of this type are quickly accepted and become part of the project.

Similar changes created by me:
#6260
#6275
#6250
#6201
#6187
#6041
and many more.

[SimonCW]

Awesome, thanks so much for the feedback @mik-laj.