some miss and mistake in pmm2 doc

Percona Monitoring and Management (PMM) PMM 1.x
1

Hi，
when i read the doc of pmm2 。I found something missed in the [URL]https://www.percona.com/doc/percona-monitoring-and-management/2.x/concepts/services-mongodb.html[/URL] 。And also ,there hava a mistake in this topic。Can you fix it?thanks!

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