Version Control With Subversion Source

* en/book/ch09-reference.xml
Add <refmeta> sections with better section titles so that when
linking to a reference section, the anchor text is more like

... for more information, see the "svn status" section of
"Subversion Complete Reference".

instead of merely:

... for more information, see svn status.

While here, sort 'svndumpfilter help' before 'svndumpfilter include'.