Documentation/osnoise: Escape underscore of NO_ prefix

kernel test robot reported unknown target name warning:

Documentation/trace/osnoise-tracer.rst:112: WARNING: Unknown target name: "no".

The warning causes NO_ prefix to be rendered as link text instead, which
points to non-existent link target.

Escape the prefix underscore to fix the warning.

Link: https://lkml.kernel.org/r/[email protected]

Cc: Masami Hiramatsu <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Ammar Faizi <[email protected]>
Cc: GNU/Weeb Mailing List <[email protected]>
Link: https://lore.kernel.org/linux-doc/[email protected]/
Fixes: 67543cd ("Documentation/osnoise: Add osnoise/options documentation")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Bagas Sanjaya <[email protected]>
Acked-by: Daniel Bristot de Oliveira <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: bagasme

Documentation/trace/osnoise-tracer.rst

@@ -111,7 +111,7 @@ The tracer has a set of options inside the osnoise directory, they are:
    be used, which is currently 5 us.
  - osnoise/options: a set of on/off options that can be enabled by
    writing the option name to the file or disabled by writing the option
-   name preceded with the 'NO_' prefix. For example, writing
+   name preceded with the 'NO\_' prefix. For example, writing
    NO_OSNOISE_WORKLOAD disables the OSNOISE_WORKLOAD option. The
    special DEAFAULTS option resets all options to the default value.