chore(cx-api): adding missing readme's

[IkeNefcy]

Issue

Closes #33795

Reason for this change

filling in missing readme changes from PRs #33360 and #33742

Description of changes

Added the comment wall back in, not sure what happened there.
//////////////////////////////////////////////////////////////////////

Added readme's based on the ff descriptions

aws-cdk/packages/aws-cdk-lib/cx-api/README.md

Lines 632 to 660 in d1611f7

	* `@aws-cdk/aws-s3:setUniqueReplicationRoleName`
	When this feature flag is enabled, a unique role name is specified only when performing cross-account replication.
	When disabled, 'CDKReplicationRole' is always specified.
	_cdk.json_
	```json
	{
	"context": {
	"@aws-cdk/aws-s3:setUniqueReplicationRoleName": true
	}
	}
	```
	* `@aws-cdk/pipelines:reduceStageRoleTrustScope`
	When this feature flag is enabled, the root account principal will not be added to the trust policy of stage role.
	When this feature flag is disabled, it will keep the root account principal in the trust policy.
	_cdk.json_
	```json
	{
	"context": {
	"@aws-cdk/pipelines:reduceStageRoleTrustScope": true
	}
	}
	```

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (ab6ba09) to head (d1611f7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33796   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files         120      120           
  Lines        6937     6937           
  Branches     1170     1170           
=======================================
  Hits         5715     5715           
  Misses       1119     1119           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.38% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.38% <ø> (ø)

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: d1611f7
• Result: SUCCEEDED
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[QuantumNeuralCoder]

Verified the changes by comparing the 2 PRs listed (one of them is my PR)

[mergify]

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