* cygwin.xsl (toc.section.depth): Set to 4.

* ntsec.xml: Revamp account mapping documentation to account for the
	new db_home, db_shell, db_gecos settings.

winsup/doc/cygwin.xsl

@@ -8,6 +8,6 @@
 <xsl:param name="html.stylesheet" select="'docbook.css'"/>
 <xsl:param name="use.id.as.filename" select="1" />
 <xsl:param name="root.filename" select="@id" />
-<xsl:param name="toc.section.depth" select="3" />
+<xsl:param name="toc.section.depth" select="4" />
 
 </xsl:stylesheet>