doc/man/mc.1.in: clarify formatting.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

doc/man/mc.1.in

@@ -3423,7 +3423,7 @@ Extfs filesystems can be divided into two categories:
 1. Stand\-alone filesystems, which are not associated with any existing
 file.  They represent certain system\-wide data as a directory tree.
 You can invoke them by typing
-.RI ' "cd fsname://" '
+.I "cd fsname://"
 where fsname is an extfs short name (see below).  Examples of such
 filesystems include audio (list audio tracks on the CD) or apt (list of
 all Debian packages in the system).
@@ -3439,7 +3439,7 @@ contents of a file as a directory tree.  It can consist of 'real' files
 compressed in an archive (urar, rpm) or virtual files, like messages
 in a mailbox (mailfs) or parts of a patch (patchfs).  To access such
 filesystems
-.RI ' fsname:// '
+.I fsname://
 should be appended to the archive name.  Note that the archive itself
 can be on another vfs.
 .PP
@@ -4300,7 +4300,7 @@ everywhere).
 .SH "FILES"
 Full paths below may vary between installations.  They are also affected
 by the
-.BR MC_DATADIR
+.B MC_DATADIR
 environment variable. If it's set, its value is used instead of
 %prefix%/share/mc in the paths below.
 .PP
@@ -4363,7 +4363,7 @@ Local user\-defined menu. If this file is present, it is used instead of
 the home or system\-wide applications menu.
 .PP
 To change default root directory of MC, you can use
-.BR MC_PROFILE_ROOT
+.B MC_PROFILE_ROOT
 environment variable. The value of MC_PROFILE_ROOT must be an absolute path.
 If MC_PROFILE_ROOT is unset or empty, HOME variable is used. If HOME is unset
 or empty, MC directories are get from GLib library.