HADOOP-19349: S3A : Improve Client Side Encryption Documentation

[shameersss1]

Description of PR

Improve S3A Client Side Encryption Documentation

How was this patch tested?

NA

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 50s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	48m 3s		trunk passed
+1 💚	mvnsite	0m 44s		trunk passed
+1 💚	shadedclient	88m 39s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 30s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 34s		the patch passed
+1 💚	shadedclient	39m 54s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		132m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.47 ServerAPI=1.47 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7191/1/artifact/out/Dockerfile
GITHUB PR	#7191
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux ba06e65ee27d 5.15.0-125-generic #135-Ubuntu SMP Fri Sep 27 13:53:58 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / ffb9d61
Max. process+thread count	527 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7191/1/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

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[steveloughran]

LGTM
+1

[steveloughran]

@shameersss1 For a backport to branch 3.4, you can coalesce these into one single commit, just by saying includes: and then including the titles of the two followup patches; makes it easier to cherrypick elsewhere later.

[shameersss1]

@steveloughran - The changes are not merged to trunk yet. The jira is marked as resolved. Please do the needful