doc/rados: standardize markup of "clean"

Standardize the markup around the status "clean" in the documentation so
that readers don't mistakenly get the idea that inconsistent
presentation of the word "clean" implies a never-stated difference
between one instance and the other.

Signed-off-by: Zac Dover <[email protected]>

Author: zdover23

doc/rados/operations/health-checks.rst

@@ -1502,10 +1502,10 @@ This health check is raised if a certain percentage (determined by
 :confval:`mon_warn_pg_not_deep_scrubbed_ratio`) of the interval has elapsed
 after the time the scrub was scheduled and no scrub has been performed.
 
-PGs will receive a deep scrub only if they are flagged as *clean* (which means
-that they are to be cleaned, and not that they have been examined and found to
-be clean). Misplaced or degraded PGs might not be flagged as ``clean`` (see
-*PG_AVAILABILITY* and *PG_DEGRADED* above).
+PGs will receive a deep scrub only if they are flagged as ``clean`` (which
+means that they are to be cleaned, and not that they have been examined and
+found to be clean). Misplaced or degraded PGs might not be flagged as ``clean``
+(see *PG_AVAILABILITY* and *PG_DEGRADED* above).
 
 This document offers two methods of setting the value of
 :confval:`osd_deep_scrub_interval`. The first method listed here changes the