Add examples for GenerateDataKey* operations

[juneb]

Description of changes: Ongoing project to improve the quality and coverage of KMS CLI examples.

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[codecov-commenter]

Codecov Report

Merging #7141 (d96111e) into develop (df4ced6) will decrease coverage by 92.80%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #7141       +/-   ##
===========================================
- Coverage    92.88%   0.08%   -92.81%     
===========================================
  Files          204     205        +1     
  Lines        16351   16438       +87     
===========================================
- Hits         15188      14    -15174     
- Misses        1163   16424    +15261     

Impacted Files	Coverage Δ
awscli/text.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/plugin.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/schema.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/handlers.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/paramfile.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/topictags.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/bcdoc/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/bcdoc/docevents.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/customizations/ecr.py	0.00% <0.00%> (-100.00%)	:arrow_down:
awscli/customizations/iot.py	0.00% <0.00%> (-100.00%)	:arrow_down:
... and 193 more

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[juneb]

Filed the required ticket with aws-docs: P69076988

[elysahall]

Hi June, Also responded to the ticket. A couple of minor fixes:

• In generate-data-key-pair-without-plaintext.rst and generate-data-key-pair.rst in the code example you list --key-id twice. --key-id --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \

• In generate-data-key.rst you have multiple examples and are missing the Example 1: and Example 2: label.

[elysahall]

LGTM!

[juneb]

Any reason for a delay on this PR?

[kdaily]

Merged these changes as part of #7254, closing this. Thanks again for the changes!