Fix multi-paragraph list items in OPTIONS section

This patch makes the html docs right, makes the asciidoc docs a bit odd
but consistent with what is there already, and makes the manpages look
OK using docbook-xsl 1.68, but miss a paragraph separator when using 1.69.

For the manpages, current is like

       -A <author_file>
              Read a file with lines on the form

              username = User's Full Name <email@addr.es>

              and use "User's Full Name <email@addr.es>" as the GIT

With this patch, docbook-xsl v1.68 looks like

       -A <author_file>
              Read a file with lines on the form

                      username = User's Full Name <email@addr.es>

              and use "User's Full Name <email@addr.es>" as the GIT author and

while docbook-xsl v1.69 becomes

       -A <author_file>
              Read a file with lines on the form

                        username = User's Full Name <email@addr.es>
              and use "User's Full Name <email@addr.es>" as the GIT author and

The extra indentation is to keep the v1.69 manpage looking sane.

Documentation/git-cvsimport.txt

@@ -99,21 +99,24 @@ If you need to pass multiple options, separate them with a comma.
 	CVS by default uses the unix username when writing its
 	commit logs. Using this option and an author-conv-file
 	in this format
-
++
+---------
 	exon=Andreas Ericsson <ae@op5.se>
 	spawn=Simon Pawn <spawn@frog-pond.org>
 
-	git-cvsimport will make it appear as those authors had
-	their GIT_AUTHOR_NAME and GIT_AUTHOR_EMAIL set properly
-	all along.
-
-	For convenience, this data is saved to $GIT_DIR/cvs-authors
-	each time the -A option is provided and read from that same
-	file each time git-cvsimport is run.
-
-	It is not recommended to use this feature if you intend to
-	export changes back to CVS again later with
-	git-link[1]::git-cvsexportcommit.
+---------
++
+git-cvsimport will make it appear as those authors had
+their GIT_AUTHOR_NAME and GIT_AUTHOR_EMAIL set properly
+all along.
++
+For convenience, this data is saved to $GIT_DIR/cvs-authors
+each time the -A option is provided and read from that same
+file each time git-cvsimport is run.
++
+It is not recommended to use this feature if you intend to
+export changes back to CVS again later with
+git-link[1]::git-cvsexportcommit.
 
 OUTPUT
 ------

Documentation/git-svnimport.txt

@@ -75,18 +75,21 @@ When importing incrementally, you might need to edit the .git/svn2git file.
 
 -A <author_file>::
 	Read a file with lines on the form
-
++
+------
 	username = User's Full Name <email@addr.es>
 
-	and use "User's Full Name <email@addr.es>" as the GIT
-	author and committer for Subversion commits made by
-	"username". If encountering a commit made by a user not in the
-	list, abort.
-
-	For convenience, this data is saved to $GIT_DIR/svn-authors
-	each time the -A option is provided, and read from that same
-	file each time git-svnimport is run with an existing GIT
-	repository without -A.
+------
++
+and use "User's Full Name <email@addr.es>" as the GIT
+author and committer for Subversion commits made by
+"username". If encountering a commit made by a user not in the
+list, abort.
++
+For convenience, this data is saved to $GIT_DIR/svn-authors
+each time the -A option is provided, and read from that same
+file each time git-svnimport is run with an existing GIT
+repository without -A.
 
 -m::
 	Attempt to detect merges based on the commit message. This option