doc/radosgw: edit metrics.rst

Edit doc/radosgw/metrics.rst.

Incorporate Anthony D'Atri's suggestion from
ceph#62893 (comment) into the
RADOSGW documentation.

This commit clarifies the English that explains the behavior of
rgw-multitenancy.

Signed-off-by: Zac Dover <[email protected]>
(cherry picked from commit c7e49b8)

Author: zdover23

doc/radosgw/metrics.rst

@@ -152,9 +152,10 @@ Op metrics can also be tracked per-user or per-bucket. These metrics are exporte
         ...
     ]
 
-:ref:`rgw-multitenancy` allows the use of buckets and users of the same name
-simultaneously. If a user or bucket lies under a tenant, a label for the tenant
-in the form ``Tenant = {tenantid}`` is added to the metric.
+:ref:`rgw-multitenancy` allows the use of buckets and users with the same name,
+if they are created under different tenants.  If a user or bucket lies under a
+tenant, a label for the tenant in the form ``Tenant = {tenantid}`` is added to
+the metric.
 
 In a large system with many users and buckets, it may not be tractable to export all metrics to Prometheus. For that reason, the collection of these labeled metrics is disabled by default.