Documentation/git-svn: document some of the newer features
Documentation/git-svn: document some of the newer features

I've forgotten to document many of the features added along the
way in the manpages.  This fills in some holes in the
documentation and adds updates some outdated information.

Signed-off-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git