sphinx: update docbook->rst conversion script match C domain spec

Function references should include the parens (), struct references
should not include "struct".

Signed-off-by: Jani Nikula <[e-mail]>

Documentation/sphinx/convert_template.sed

···
 #
 # Use "$bq" instead of "`" so that pandoc won't mess with it.
 #
-s%<function>\([^<(]\+\)()</function>%:c:func:$bq\1$bq%g
-s%<function>\([^<(]\+\)</function>%:c:func:$bq\1$bq%g
-s%<structname>struct *\([^<]\+\)</structname>%:ref:$bqstruct \1$bq%g
-s%<structname>\([^<]\+\)</structname>%:ref:$bqstruct \1$bq%g
+s%<function>\([^<(]\+\)()</function>%:c:func:$bq\1()$bq%g
+s%<function>\([^<(]\+\)</function>%:c:func:$bq\1()$bq%g
+s%<structname>struct *\([^<]\+\)</structname>%:c:type:$bq\1$bq%g
+s%<structname>\([^<]\+\)</structname>%:c:type:$bq\1$bq%g
 #
 # Wrap docproc directives in para and code blocks.
 #