Documentation/admin-guide: cgroup-v2: drop doubled word

Drop the doubled word "of".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: cgroups@vger.kernel.org
Link: https://lore.kernel.org/r/20200704032020.21923-2-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/cgroup-v2.rst

@@ -2043,7 +2043,7 @@ RDMA
 ----
 
 The "rdma" controller regulates the distribution and accounting of
-of RDMA resources.
+RDMA resources.
 
 RDMA Interface Files
 ~~~~~~~~~~~~~~~~~~~~