Merge pull request ceph#44711 from zdover23/wip-doc-2022-01-21-rados-bluestore-cache-autotune-interval-rewrite-2

src/rados: rewrite bs cache autotune instructions

Reviewed-by: Laura Flores <[email protected]>

Author: zdover23

src/common/options/global.yaml.in

@@ -4695,10 +4695,10 @@ options:
   level: dev
   desc: The number of seconds to wait between rebalances when cache autotune is enabled.
   fmt_desc: |
-    The number of seconds to wait between rebalances when cache autotune
-    is enabled.  This setting changes how quickly the allocation ratios of
-    various caches are recomputed.  Note:  Setting this interval too small
-    can result in high CPU usage and lower performance.
+    The number of seconds to wait between rebalances when cache autotune is
+    enabled.  `bluestore_cache_autotune_interval` sets the speed at which Ceph
+    recomputes the allocation ratios of various caches. Note: Setting this
+    interval too small can result in high CPU usage and lower performance.
   default: 5
   see_also:
   - bluestore_cache_autotune