[PATCH 1/6] doc: Explain light-handed markup preference a bit better

[Daniel Vetter <daniel.vetter@ffwll.ch>]

We already had a super-short blurb, but worth extending it I think:
We're still pretty far away from anything like a consensus, but
there's clearly a lot of people who prefer an as-light as possible
approach to converting existing .txt files to .rst. Make sure this is
properly taken into account and clear.

Motivated by discussions with Peter and Christoph and others.

v2:
- Mention that existing headings should be kept when converting
  existing .txt files (Mauro).
- Explain that we prefer :: for quoting code, it's easier on the
  eyes (Mauro).
- Explain that blindly converting outdated docs is harmful. Motived
  by comments Peter did in our discussion.

v3: Make the explanations around fixed-width quoting more concise
(Jani).

v4:
- Rebase onto docs-4.10.
- Go with the more terse recommendation from Jani, defer to the much
  more detailed conversion guide Mauro is working on for details.

Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 Documentation/doc-guide/sphinx.rst | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/Documentation/doc-guide/sphinx.rst b/Documentation/doc-guide/sphinx.rst
index 96fe7ccb2c67..532d65b70500 100644
--- a/Documentation/doc-guide/sphinx.rst
+++ b/Documentation/doc-guide/sphinx.rst
@@ -73,7 +73,16 @@ Specific guidelines for the kernel documentation
 
 Here are some specific guidelines for the kernel documentation:
 
-* Please don't go overboard with reStructuredText markup. Keep it simple.
+* Please don't go overboard with reStructuredText markup. Keep it
+  simple. For the most part the documentation should be plain text with
+  just enough consistency in formatting that it can be converted to
+  other formats.
+
+* Please keep the formatting changes minimal when converting existing
+  documentation to reStructuredText.
+
+* Also update the content, not just the formatting, when converting
+  documentation.
 
 * Please stick to this order of heading adornments:
 
@@ -103,6 +112,12 @@ Here are some specific guidelines for the kernel documentation:
   the order as encountered."), having the higher levels the same overall makes
   it easier to follow the documents.
 
+* For inserting fixed width text blocks (for code examples, use case
+  examples, etc.), use ``::`` for anything that doesn't really benefit
+  from syntax highlighting, especially short snippets. Use
+  ``.. code-block:: <language>`` for longer code blocks that benefit
+  from highlighting.
+
 
 the C domain
 ------------
-- 
2.11.0

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