HADOOP-17598. Fix java doc issue introduced by HADOOP-17578.

[xiaoyuyao]

https://issues.apache.org/jira/browse/HADOOP-17598

[aajisaka]

Thank you @xiaoyuyao

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 0s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	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.
			_ trunk Compile Tests _
+1 💚	mvninstall	35m 21s		trunk passed
+1 💚	compile	22m 36s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	19m 8s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	checkstyle	0m 59s		trunk passed
+1 💚	mvnsite	1m 27s		trunk passed
-1 ❌	javadoc	0m 58s	/branch-javadoc-hadoop-common-project_hadoop-common-jdkUbuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04.txt	hadoop-common in trunk failed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04.
+1 💚	javadoc	1m 31s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	2m 19s		trunk passed
+1 💚	shadedclient	17m 47s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 57s		the patch passed
+1 💚	compile	21m 52s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javac	21m 52s		the patch passed
+1 💚	compile	19m 3s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	javac	19m 3s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 58s		the patch passed
+1 💚	mvnsite	1m 24s		the patch passed
+1 💚	javadoc	0m 58s		hadoop-common-project_hadoop-common-jdkUbuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 generated 0 new + 99 unchanged - 1 fixed = 99 total (was 100)
+1 💚	javadoc	1m 32s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	2m 29s		the patch passed
+1 💚	shadedclient	18m 1s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	17m 4s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 48s		The patch does not generate ASF License warnings.
		187m 57s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2802/1/artifact/out/Dockerfile
GITHUB PR	#2802
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux ea2ac6ae49a1 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / d1dff59
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2802/1/testReport/
Max. process+thread count	1272 (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-2802/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[ayushtkn]

+1