Documentation: trace: histogram-design: Wrap introductory note in note:: directive

Use Sphinx note:: directive for the introductory note at the beginning
of docs, instead of aligned-text paragraph that renders as definition
list.

Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250916054202.582074-6-bagasdotme@gmail.com>

Author: bagasme

Documentation/trace/histogram-design.rst

@@ -11,13 +11,14 @@ histograms work and how the individual pieces map to the data
 structures used to implement them in trace_events_hist.c and
 tracing_map.c.
 
-Note: All the ftrace histogram command examples assume the working
-      directory is the ftrace /tracing directory. For example::
+.. note::
+   All the ftrace histogram command examples assume the working
+   directory is the ftrace /tracing directory. For example::
 
 	# cd /sys/kernel/tracing
 
-Also, the histogram output displayed for those commands will be
-generally be truncated - only enough to make the point is displayed.
+   Also, the histogram output displayed for those commands will be
+   generally be truncated - only enough to make the point is displayed.
 
 'hist_debug' trace event files
 ==============================