HADOOP-18532. Update command usage in FileSystemShell.md

[GuoPhilipse]

JIRA:HADOOP-18532
Fixt typos and update usage in FileSystemShell.md

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 55s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+0 🆗	markdownlint	0m 1s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	39m 35s		trunk passed
+1 💚	mvnsite	1m 34s		trunk passed
+1 💚	shadedclient	61m 17s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 0s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 18s		the patch passed
+1 💚	shadedclient	21m 15s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 52s		The patch does not generate ASF License warnings.
		87m 17s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5141/1/artifact/out/Dockerfile
GITHUB PR	#5141
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 2fb0fd4899cb 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / b45cef9
Max. process+thread count	558 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5141/1/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[slfan1989]

@GuoPhilipse Thank you for your contribution, LGTM.
Can we include the Jira number in the title of the pr?

[hotcodemacha]

Thanks @GuoPhilipse for your contribution. Please file a JIRA and update the PR with it.

[GuoPhilipse]

thanks @slfan1989 @ashutoshcipher for your review, seems i cannot open issues.apache.org ,will fire a JIRA once logged

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 0s		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	38m 58s		trunk passed
+1 💚	mvnsite	1m 33s		trunk passed
+1 💚	shadedclient	60m 23s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 6s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 24s		the patch passed
+1 💚	shadedclient	21m 8s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 45s		The patch does not generate ASF License warnings.
		85m 56s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5141/2/artifact/out/Dockerfile
GITHUB PR	#5141
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 2a8d399fa36d 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 3b80fed
Max. process+thread count	756 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5141/2/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[aajisaka]

LGTM, +1

[aajisaka]

Thank you @GuoPhilipse for your contribution and thank you @slfan1989 @ashutoshcipher for your reviews!