[PATCH v2] docs/doc-guide: Mention make variable SPHINXDIRS

[Akira Yokosawa <akiyks@gmail.com>]

SPHINXDIRS is useful when you want to test build only those
documents affected by your changes.

Mention it in the "Sphinx Build" section.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Cc: Maciej W. Rozycki <macro@orcam.me.uk>
---
v1 -> v2:
  - Added command example (Jon)

v1: https://lore.kernel.org/r/ff89c064-e24a-0f2f-fc03-b029e5d04338@gmail.com/
--
 Documentation/doc-guide/sphinx.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/doc-guide/sphinx.rst b/Documentation/doc-guide/sphinx.rst
index edc4fa023986..1228b85f6f77 100644
--- a/Documentation/doc-guide/sphinx.rst
+++ b/Documentation/doc-guide/sphinx.rst
@@ -151,6 +151,13 @@ If the theme is not available, it will fall-back to the classic one.
 
 The Sphinx theme can be overridden by using the ``DOCS_THEME`` make variable.
 
+There is another make variable ``SPHINXDIRS``, which is useful when test
+building a subset of documentation.  For example, you can build documents
+under ``Documentation/doc-guide`` by running
+``make SPHINXDIRS=doc-guide htmldocs``.
+The documentation section of ``make help`` will show you the list of
+subdirectories you can specify.
+
 To remove the generated documentation, run ``make cleandocs``.
 
 .. [#ink] Having ``inkscape(1)`` from Inkscape (https://inkscape.org)

base-commit: 0ebe4dd124d3a0e708ea24734c13d52657e36363
-- 
2.25.1