Prometheus: Change title

[rhetoric101]

Clarify that this integration is for host monitoring (per SME).

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[nbaenam]

It looks good to me, although the nav title is Node Exporter and we should try to keep the consistency between nav titles and doc titles.

[rhetoric101]

@nbaenam good point! Still, in this case, we're just adding this to help search engine optimization. I think it'll be OK to keep the shorter version in the left navigation because the longer version would be difficult to scan in the list.