Avoid legacy name for Nexus

[jsoref]

[wwannemacher]

Nexus refers to our suite of products, in the context of the change, NXRM is correct.

[jsoref]

This is pretty much the only place where a human runs into NXRM. While it is possible to search for the token, it isn't commonly found in the UI.

[joedragons]

Defined here: https://help.sonatype.com/display/NXRM3. 2nd result on "what is NXRM" on google. I am +1 to close and leave alone.

[Zeckie]

Defined here: https://help.sonatype.com/display/NXRM3. 2nd result on "what is NXRM" on google. I am +1 to close and leave alone.

That link now redirects to https://help.sonatype.com/repomanager3

[RuanXinyu]

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