docs: kprobes.txt: Fix whitespacing

The notes at the end of this file start with a blank space,
instead of a blank line, violating ReST format.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/kprobes.txt

@@ -819,7 +819,8 @@ a knob to globally and forcibly turn jump optimization (see section
 is allowed (ON). If you echo "0" to this file or set
 "debug.kprobes_optimization" to 0 via sysctl, all optimized probes will be
 unoptimized, and any new probes registered after that will not be optimized.
- Note that this knob *changes* the optimized state. This means that optimized
+
+Note that this knob *changes* the optimized state. This means that optimized
 probes (marked [OPTIMIZED]) will be unoptimized ([OPTIMIZED] tag will be
 removed). If the knob is turned on, they will be optimized again.