Update gitaly_cgroups metric name in docs
What does this MR do and why?
Update gitaly_cgroups metric name
The gitaly_cgroup_memory_failed_total metric name is actually a misnomer. It is, more accurately, the number of memory reclaim attempts that cgroups makes. Rename this metric to be more accurate.
gitaly!4619 (merged) is the Gitaly MR that makes this change.
Also, the feature flags note on cgroups is in the wrong place and doesn't quite communicate the right thing. The feature flag in fact controls whether or not cgroups works at all. Move this bit up higher to make it clearer that the feature flag turns the whole cgroups feature on/off rather than just the new configuration method.
Changelog: changed
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