MAPREDUCE-7258. HistoryServerRest.html#Task_Counters_API, modify the jobTaskCounters's itemName from taskcounterGroup to taskCounterGroup

[cjn082030]

The API https://hadoop.apache.org/docs/stable/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html#Task_Counters_API, modify jobTaskCounters's itemName from taskcounterGroup to taskCounterGroup.

[hadoop-yetus]

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[aajisaka]

LGTM, +1

[cjn082030]

Hi @aajisaka ,
I found some minor problems with the mapreduce documentation, I want to modify them one by one.
Regarding the modification, I have two ideas:

1. Create a pr to modify all document issues
2. Create a pr and modify only one document
   Which idea do you recommend?

Thank you

[hadoop-yetus]

🎊 +1 overall

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		_ trunk Compile Tests _
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+1 💚	shadedclient	34m 48s	branch has no errors when building and testing our client artifacts.
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 27s	the patch passed
+1 💚	mvnsite	0m 24s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedclient	14m 15s	patch has no errors when building and testing our client artifacts.
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+1 💚	asflicense	0m 32s	The patch does not generate ASF License warnings.
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Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-1808/3/artifact/out/Dockerfile
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[hadoop-yetus]

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Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-1808/1/artifact/out/Dockerfile
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[aajisaka]

Sorry I forgot to merge this. Thank you @cjn082030

Which idea do you recommend?

For small document issues, you can create a PR to fix all of them.