HBASE-25862 Improve the documentation of configration

[chexunn]

Improve the documentation of configration section of reference guide

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 11s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
		_ Patch Compile Tests _
		_ Other Tests _
		2m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
GITHUB PR	#3240
Optional Tests
uname	Linux 22acb3e426fa 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 6cfff27
Max. process+thread count	42 (vs. ulimit of 30000)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	7m 11s	Docker mode activated.
-0 ⚠️	yetus	0m 2s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
		_ Patch Compile Tests _
		_ Other Tests _
		8m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#3240
Optional Tests
uname	Linux cfce9870c75c 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 6cfff27
Max. process+thread count	51 (vs. ulimit of 30000)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 7s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
+1 💚	mvninstall	4m 18s	master passed
+0 🆗	refguide	3m 46s	branch has no errors when building the reference guide. See footer for rendered docs, which you should manually inspect.
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 58s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+0 🆗	refguide	3m 39s	patch has no errors when building the reference guide. See footer for rendered docs, which you should manually inspect.
		_ Other Tests _
+1 💚	asflicense	0m 15s	The patch does not generate ASF License warnings.
		18m 36s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#3240
Optional Tests	dupname asflicense refguide
uname	Linux 60fddcc9c1f1 4.15.0-126-generic #129-Ubuntu SMP Mon Nov 23 18:53:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 6cfff27
refguide	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/artifact/yetus-general-check/output/branch-site/book.html
refguide	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/artifact/yetus-general-check/output/patch-site/book.html
Max. process+thread count	65 (vs. ulimit of 30000)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-3240/1/console
versions	git=2.17.1 maven=3.6.3
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