msync.2, getusershell.3, full.4, pts.4: Convert inline formatting (\fX...\fP) to dot-directive formatting

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/msync.2

@@ -109,7 +109,9 @@ is available, both
 .B _POSIX_MAPPED_FILES
 and
 .B _POSIX_SYNCHRONIZED_IO
-are defined in \fI<unistd.h>\fP to a value greater than 0.
+are defined in
+.I <unistd.h>
+to a value greater than 0.
 (See also
 .BR sysconf (3).)
 .\" POSIX.1-2001: It shall be defined to -1 or 0 or 200112L.

man3/getusershell.3

@@ -58,22 +58,30 @@ _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
 The
 .BR getusershell ()
 function returns the next line from the file
-\fI/etc/shells\fP, opening the file if necessary.
+.IR /etc/shells ,
+opening the file if necessary.
 The line should contain
 the pathname of a valid user shell.
-If \fI/etc/shells\fP does not exist or
+If
+.I /etc/shells
+does not exist or
 is unreadable,
 .BR getusershell ()
-behaves as if  \fI/bin/sh\fP and
-\fI/bin/csh\fP were listed in the file.
+behaves as if 
+.I /bin/sh
+and
+.I /bin/csh
+were listed in the file.
 .PP
 The
 .BR setusershell ()
-function rewinds \fI/etc/shells\fP.
+function rewinds
+.IR /etc/shells .
 .PP
 The
 .BR endusershell ()
-function closes \fI/etc/shells\fP.
+function closes
+.IR /etc/shells .
 .SH RETURN VALUE
 The
 .BR getusershell ()

man4/full.4

@@ -27,7 +27,9 @@
 .SH NAME
 full \- always full device
 .SH CONFIGURATION
-If your system does not have \fI/dev/full\fP created already, it
+If your system does not have
+.I /dev/full
+created already, it
 can be created with the following commands:
 .nf
 
@@ -35,17 +37,25 @@ can be created with the following commands:
         chown root:root /dev/full
 .fi
 .SH DESCRIPTION
-File \fI/dev/full\fP has major device number 1
+File
+.I /dev/full
+has major device number 1
 and minor device number 7.
 .LP
-Writes to the \fI/dev/full\fP device will fail with an
+Writes to the
+.I /dev/full
+device will fail with an
 .B ENOSPC
 error.
 This can be used to test how a program handles disk-full errors.
 
-Reads from the \fI/dev/full\fP device will return \\0 characters.
+Reads from the
+.I /dev/full
+device will return \\0 characters.
 
-Seeks on \fI/dev/full\fP will always succeed.
+Seeks on
+.I /dev/full
+will always succeed.
 .SH FILES
 /dev/full
 .SH SEE ALSO

man4/pts.4

@@ -9,16 +9,21 @@
 .SH NAME
 ptmx, pts \- pseudoterminal master and slave
 .SH DESCRIPTION
-The file \fI/dev/ptmx\fP is a character file with major number 5 and
+The file
+.I /dev/ptmx
+is a character file with major number 5 and
 minor number 2, usually of mode 0666 and owner.group of root.root.
 It is used to create a pseudoterminal master and slave pair.
 .PP
-When a process opens \fI/dev/ptmx\fP, it gets a file
+When a process opens
+.IR /dev/ptmx ,
+it gets a file
 descriptor for a pseudoterminal master (PTM),
 and a pseudoterminal slave (PTS) device is created in the
 .I /dev/pts
 directory.
-Each file descriptor obtained by opening \fI/dev/ptmx\fP
+Each file descriptor obtained by opening
+.IR /dev/ptmx
 is an independent PTM with its own associated PTS, whose path can
 be found by passing the descriptor to
 .BR ptsname (3).