[PATCH] DocBook/HTML: Generate chapter/section level TOCs for functions

Simple increase of section TOC level generation significantly enhances
navigation experience through generated kernel API documentation.

This change restores back state from SGML tools time.
Signed-off-by: NPavel Pisa <pisa@cmp.felk.cvut.cz>
Acked-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Documentation/DocBook/stylesheet.xsl

@@ -4,4 +4,5 @@
 <param name="funcsynopsis.style">ansi</param>
 <param name="funcsynopsis.tabular.threshold">80</param>
 <!-- <param name="paper.type">A4</param> -->
+<param name="generate.section.toc.level">2</param>
 </stylesheet>