[gtk-doc] mkhtml: add a note on docbook support

[Stefan Sauer <stefkost src gnome org>]

commit 5da37a5078ef19166271c1f69a2d9d459944a0be
Author: Stefan Sauer <ensonic users sf net>
Date:   Tue Mar 27 08:13:31 2018 +0200

    mkhtml: add a note on docbook support

 gtkdoc/mkhtml2.py |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtkdoc/mkhtml2.py b/gtkdoc/mkhtml2.py
index 3f26bea..76300e3 100644
--- a/gtkdoc/mkhtml2.py
+++ b/gtkdoc/mkhtml2.py
@@ -29,6 +29,11 @@ In contrast to our previous approach of running gtkdoc-mkhtml + gtkdoc-fixxref,
 this tools will replace both without relying on external tools such as xsltproc
 and source-highlight.
 
+Please note, that we're not aiming for complete docbook-xml support. All tags
+used in the generated xml are of course handled. More tags used in handwritten
+xml can be easilly supported, but for some combinations of tags we prefer
+simplicity.
+
 TODO:
 - more chunk converters
 - more tag converters: