docs: trace/index.rst: add histogram-design.rst

Fix the following warning:

Documentation/trace/histogram-design.rst:
WARNING: document isn't included in any toctree

By adding 'histogram-design.rst' to the index.

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Link: https://lore.kernel.org/r/20200718165107.625847-12-dwlsalmeida@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Daniel W. S. Almeida 2020-07-18 13:51:06 -03:00 committed by Jonathan Corbet
parent 3657c3eba8
commit f2ea95289a

View File

@ -20,6 +20,7 @@ Linux Tracing Technologies
events-msr
mmiotrace
histogram
histogram-design
boottime-trace
hwlat_detector
intel_th