Documentation: filesystems: convert fuse to RST

Converts fuse.txt to reStructuredText format, improving the presentation
without changing much of the underlying content.
Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

Documentation/filesystems/index.rst

@@ -47,4 +47,5 @@ Documentation for filesystem implementations.
    :maxdepth: 2
 
    autofs
+   fuse
    virtiofs

MAINTAINERS

@@ -6821,7 +6821,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git
 S:	Maintained
 F:	fs/fuse/
 F:	include/uapi/linux/fuse.h
-F:	Documentation/filesystems/fuse.txt
+F:	Documentation/filesystems/fuse.rst
 
 FUTEX SUBSYSTEM
 M:	Thomas Gleixner <tglx@linutronix.de>