docs/scheduler/sched-bwc: fix note rendering

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20210120001824.385168-4-kolyshkin@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/scheduler/sched-bwc.rst

@@ -2,8 +2,9 @@
 CFS Bandwidth Control
 =====================
 
-[ This document only discusses CPU bandwidth control for SCHED_NORMAL.
-  The SCHED_RT case is covered in Documentation/scheduler/sched-rt-group.rst ]
+.. note::
+   This document only discusses CPU bandwidth control for SCHED_NORMAL.
+   The SCHED_RT case is covered in Documentation/scheduler/sched-rt-group.rst
 
 CFS bandwidth control is a CONFIG_FAIR_GROUP_SCHED extension which allows the
 specification of the maximum CPU bandwidth available to a group or hierarchy.