[PATCH] docs: doc-guide: mention 'make refcheckdocs'

[Vegard Nossum]

Add this to the section on fixing warnings.

Cc: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxxx>
---
 Documentation/doc-guide/contributing.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/doc-guide/contributing.rst b/Documentation/doc-guide/contributing.rst
index d4793826ad9a..662c7a840cd5 100644
--- a/Documentation/doc-guide/contributing.rst
+++ b/Documentation/doc-guide/contributing.rst
@@ -138,6 +138,10 @@ times, but it's highly important.  If we can actually eliminate warnings
 from the documentation build, then we can start expecting developers to
 avoid adding new ones.
 
+In addition to warnings from the regular documentation build, you can also
+run ``make refcheckdocs`` to find references to nonexistent documentation
+files.
+
 Languishing kerneldoc comments
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-- 
2.34.1