Add doc exposition and tidy

doc/Jamfile

@@ -175,12 +175,12 @@ boostbook fixed_string
     :
         <xsl:param>boost.root=../../../..
         <xsl:param>chapter.autolabel=1
-        <xsl:param>chunk.section.depth=8                # Depth to which sections should be chunked
+        <xsl:param>chunk.section.depth=0                # Depth to which sections should be chunked
         <xsl:param>chunk.first.sections=1               # Chunk the first top-level section?
         <xsl:param>toc.section.depth=8                  # How deep should recursive sections appear in the TOC?
         <xsl:param>toc.max.depth=8                      # How many levels should be created for each TOC?
         <xsl:param>generate.section.toc.level=8         # Control depth of TOC generation in sections
-        <xsl:param>generate.toc="chapter toc,title section nop reference nop"
+        <xsl:param>generate.toc=""
         <include>../../../tools/boostbook/dtd
     :
         <dependency>images