Update most documentation for NoteDb
Remove outdated references to ReviewDb. Where ambiguous terms like
"database" are used, make sure they are still technically accurate, or
else remove them.
After this change, all documentation should be up to date with respect
to the database backend, with the exception of note-db.txt itself.
Change-Id: I7134087dc56070788e81ada6ac504b3c8fe84c4c
diff --git a/Documentation/cmd-flush-caches.txt b/Documentation/cmd-flush-caches.txt
index 55d9083..5a84b9d 100644
--- a/Documentation/cmd-flush-caches.txt
+++ b/Documentation/cmd-flush-caches.txt
@@ -16,7 +16,7 @@
truth when it needs the information again.
Flushing a cache may be necessary if an administrator modifies
-database records directly in the database, rather than going through
+NoteDb metadata directly in a repository, rather than going through
the Gerrit web interface.
If no options are supplied, defaults to `--all`.
