Documentation/git-svnimport: document -T and -t switches correctly

The -T and -t switches are swapped in the documentation and actual
code.  I've made the documentation match the code.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-svnimport.txt

@@ -11,7 +11,7 @@ SYNOPSIS
 --------
 'git-svnimport' [ -o <branch-for-HEAD> ] [ -h ] [ -v ] [ -d | -D ]
 			[ -C <GIT_repository> ] [ -i ] [ -u ] [-l limit_rev]
-			[ -b branch_subdir ] [ -t trunk_subdir ] [ -T tag_subdir ]
+			[ -b branch_subdir ] [ -T trunk_subdir ] [ -t tag_subdir ]
 			[ -s start_chg ] [ -m ] [ -M regex ]
 			<SVN_repository_URL> [ <path> ]
 
@@ -47,10 +47,10 @@ When importing incrementally, you might need to edit the .git/svn2git file.
 	ensures the working directory and index remain untouched and will
 	not create them if they do not exist.
 
--t <trunk_subdir>::
+-T <trunk_subdir>::
 	Name the SVN trunk. Default "trunk".
 
--T <tag_subdir>::
+-t <tag_subdir>::
 	Name the SVN subdirectory for tags. Default "tags".
 
 -b <branch_subdir>::