HBASE-27980 Sync the hbck2 README page and hbck2 command help output

[NihalJain]

• Sync the readme and help output, both ways and finally paste help output in readme file
• Fix errors and formatting issues, here and there
• Fix ordering of new commands in code, as we follow alphabetical ordering of commands
• Also syncing readme with help output, exposes new commands like recoverUnknown and regionInfoMismatch in the README.md

[NihalJain]

Simple documentation change. Could someone please review?

CC: @wchevreuil , @Reidddddd , @petersomogyi

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 29s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	markdownlint	0m 0s	markdownlint was not available.
+0 🆗	spotbugs	0m 0s	spotbugs executables are not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
-0 ⚠️	test4tests	0m 0s	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ master Compile Tests _
+1 💚	mvninstall	0m 46s	master passed
+1 💚	compile	0m 10s	master passed
+1 💚	checkstyle	0m 8s	master passed
+1 💚	javadoc	0m 8s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 12s	the patch passed
+1 💚	compile	0m 10s	the patch passed
+1 💚	javac	0m 10s	the patch passed
+1 💚	checkstyle	0m 5s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	0m 6s	the patch passed
		_ Other Tests _
+1 💚	unit	4m 50s	hbase-hbck2 in the patch passed.
+1 💚	asflicense	0m 6s	The patch does not generate ASF License warnings.
		8m 19s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-Operator-Tools-PreCommit/job/PR-134/1/artifact/yetus-precommit-check/output/Dockerfile
GITHUB PR	#134
Optional Tests	dupname asflicense markdownlint javac javadoc unit spotbugs findbugs checkstyle compile
uname	Linux 328c6a254c34 5.4.0-156-generic #173-Ubuntu SMP Tue Jul 11 07:25:22 UTC 2023 x86_64 GNU/Linux
Build tool	maven
git revision	master / ed47187
Default Java	Oracle Corporation-1.8.0_342-b07
Test Results	https://ci-hbase.apache.org/job/HBase-Operator-Tools-PreCommit/job/PR-134/1/testReport/
Max. process+thread count	1266 (vs. ulimit of 5000)
modules	C: hbase-hbck2 U: hbase-hbck2
Console output	https://ci-hbase.apache.org/job/HBase-Operator-Tools-PreCommit/job/PR-134/1/console
versions	git=2.30.2 maven=3.8.6
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

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[petersomogyi]

Thanks @NihalJain!