Add example of TableSchema for immutable class.

[debora-ito]

Description

Following feedback received in #2216, this adds an example of creating a TableSchema for immutable class to the DynamoDB Enhanced client Overview.

Plus small fixes in a couple of examples.

Motivation and Context

Closes #2216.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation

License

• I confirm that this pull request can be released under the Apache 2 license

[codecov-io]

Codecov Report

Merging #2227 (7f7db03) into master (9b93b14) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2227      +/-   ##
============================================
+ Coverage     77.61%   77.62%   +0.01%     
  Complexity      335      335              
============================================
  Files          1230     1230              
  Lines         38713    38713              
  Branches       3045     3045              
============================================
+ Hits          30048    30052       +4     
+ Misses         7204     7202       -2     
+ Partials       1461     1459       -2     

Flag	Coverage Δ	Complexity Δ
unittests	77.62% <ø> (+0.01%)	0.00 <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...ty/internal/IdleConnectionCountingChannelPool.java	86.58% <0.00%> (-2.44%)	0.00% <0.00%> (ø%)
...ssdk/core/internal/async/FileAsyncRequestBody.java	83.80% <0.00%> (+2.85%)	0.00% <0.00%> (ø%)
...nio/netty/internal/OldConnectionReaperHandler.java	90.90% <0.00%> (+9.09%)	0.00% <0.00%> (ø%)

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