doc/glossary.rst: add "Monitor Store"

Add the term "Monitor Store" to the glossary.

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

Author: zdover23

doc/glossary.rst

@@ -274,6 +274,11 @@
 	:ref:`MON<arch_monitor>`
 		The Ceph monitor software.
 
+        Monitor Store
+                The persistent storage that is used by the Monitor. This
+                includes the Monitor's RocksDB and all related files in
+                ``/var/lib/ceph``.
+
 	Node
                 See :term:`Ceph Node`.