[PATCH 1/5] docs/doc-guide: Add footnote on Inkscape for better images in PDF documents

[Akira Yokosawa <akiyks@gmail.com>]

With kernel releases v5.18 and later, if you have Inkscape, images
embedded in PDF documents are of vector graphics, not the raster
images as are the case with pre-v5.18 releases.
Even with pre-5.18 releases, having Inkscape would improve images
converted from some of SVG files which are not fully covered by the
limited capability of rsvg-convert(1) [1].

Add a footnote mentioning the expected improvements of such images.

Link: https://gitlab.gnome.org/GNOME/librsvg#non-goals-of-librsvg [1]
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
---
 Documentation/doc-guide/sphinx.rst | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/doc-guide/sphinx.rst b/Documentation/doc-guide/sphinx.rst
index 2ff1ab4158d4..edc4fa023986 100644
--- a/Documentation/doc-guide/sphinx.rst
+++ b/Documentation/doc-guide/sphinx.rst
@@ -132,7 +132,8 @@ format-specific subdirectories under ``Documentation/output``.
 To generate documentation, Sphinx (``sphinx-build``) must obviously be
 installed. For prettier HTML output, the Read the Docs Sphinx theme
 (``sphinx_rtd_theme``) is used if available. For PDF output you'll also need
-``XeLaTeX`` and ``convert(1)`` from ImageMagick (https://www.imagemagick.org).
+``XeLaTeX`` and ``convert(1)`` from ImageMagick
+(https://www.imagemagick.org).\ [#ink]_
 All of these are widely available and packaged in distributions.
 
 To pass extra options to Sphinx, you can use the ``SPHINXOPTS`` make
@@ -152,6 +153,10 @@ The Sphinx theme can be overridden by using the ``DOCS_THEME`` make variable.
 
 To remove the generated documentation, run ``make cleandocs``.
 
+.. [#ink] Having ``inkscape(1)`` from Inkscape (https://inkscape.org)
+	  as well would improve the quality of images embedded in PDF
+	  documents, especially for kernel releases 5.18 and later.
+
 Writing Documentation
 =====================
 
-- 
2.25.1