[ping] [wwwdocs] Add reference to pp_format to Coding Conventions

[Jonathan Wakely <jwakely@redhat.com>]

ping...

On 21/09/22 10:39 +0100, Jonathan Wakely wrote:
>Finding the docs for the GCC-specific diagnostic formats isn't easy.
>This might help.
>
>OK for wwwdocs?

-- >8 --

  htdocs/codingconventions.html | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/htdocs/codingconventions.html b/htdocs/codingconventions.html
index e4d30510..f1d1f165 100644
--- a/htdocs/codingconventions.html
+++ b/htdocs/codingconventions.html
@@ -333,7 +333,8 @@ code token.</li>
  <li>Diagnostics using the GCC diagnostic functions should generally
  use the GCC-specific formats such as <code>%qs</code> or
  <code>%&lt;</code> and <code>%&gt;</code> for quoting and
-<code>%m</code> for <code>errno</code> numbers.</li>
+<code>%m</code> for <code>errno</code> numbers. See
+<tt>pp_format</tt> in <tt>pretty-print.cc</tt> for supported formats.</li>

  <li>Identifiers should generally be formatted with <code>%E</code> or
  <code>%qE</code>; use of <code>identifier_to_locale</code> is needed