adapt metrics-lib official name to Tor Metrics Library
This only affects documentation. The package renaming is done in task #19616 (moved).
Remove all usages of 'DescripTor' and replace them by 'Tor Metrics Library' or 'Metrics Library'. The technical short name is 'metrics-lib' (i.e., trac)
(optimistically set milestone to 2.0.0)
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