Documentation: filesystems: Convert ufs.txt to reStructuredText format

This converts the plain text documentation of ufs.txt to
reStructuredText format. Added to documentation build process
and verified with make htmldocs

Signed-off-by: Shobhit Kukreti <shobhitkukreti@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/index.rst

@@ -79,6 +79,7 @@ configure specific aspects of kernel behavior to your liking.
    binderfs
    xfs
    jfs
+   ufs
    pm/index
    thunderbolt
    LSM/index

Documentation/admin-guide/ufs.rst

@@ -1,37 +1,45 @@
-USING UFS
+=========
+Using UFS
 =========
 
 mount -t ufs -o ufstype=type_of_ufs device dir
 
 
-UFS OPTIONS
+UFS Options
 ===========
 
 ufstype=type_of_ufs
 	UFS is a file system widely used in different operating systems.
 	The problem are differences among implementations. Features of
 	some implementations are undocumented, so its hard to recognize
-	type of ufs automatically. That's why user must specify type of 
+	type of ufs automatically. That's why user must specify type of
 	ufs manually by mount option ufstype. Possible values are:
 
-	old	old format of ufs
+	old
+                old format of ufs
 		default value, supported as read-only
 
-	44bsd	used in FreeBSD, NetBSD, OpenBSD
+	44bsd
+                used in FreeBSD, NetBSD, OpenBSD
 		supported as read-write
 
-	ufs2    used in FreeBSD 5.x
+	ufs2
+                used in FreeBSD 5.x
 		supported as read-write
 
-	5xbsd	synonym for ufs2
+	5xbsd
+                synonym for ufs2
 
-	sun	used in SunOS (Solaris)
+	sun
+                used in SunOS (Solaris)
 		supported as read-write
 
-	sunx86	used in SunOS for Intel (Solarisx86)
+	sunx86
+                used in SunOS for Intel (Solarisx86)
 		supported as read-write
 
-	hp	used in HP-UX
+	hp
+                used in HP-UX
 		supported as read-only
 
 	nextstep
@@ -47,14 +55,14 @@ ufstype=type_of_ufs
 		supported as read-only
 
 
-POSSIBLE PROBLEMS
-=================
+Possible Problems
+-----------------
 
 See next section, if you have any.
 
 
-BUG REPORTS
-===========
+Bug Reports
+-----------
 
 Any ufs bug report you can send to daniel.pirkl@email.cz or
 to dushistov@mail.ru (do not send partition tables bug reports).