chown.2, clone.2, mmap.2, pipe.2, ftw.3, mq_notify.3: Add "Program source" subheading under EXAMPLE

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

man2/chown.2

@@ -35,7 +35,7 @@
 .\"     (bsdgroups versus sysvgroups, and the effect of the parent
 .\"     directory's set-group-ID permission bit).
 .\"
-.TH CHOWN 2 2010-11-22 "Linux" "Linux Programmer's Manual"
+.TH CHOWN 2 2014-01-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 chown, fchown, lchown \- change ownership of a file
 .SH SYNOPSIS
@@ -294,8 +294,8 @@ The new owner can be specified either as a numeric user ID,
 or as a username (which is converted to a user ID by using
 .BR getpwnam (3)
 to perform a lookup in the system password file).
+.SS Program source
 .nf
-
 #include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>

man2/clone.2

@@ -42,7 +42,7 @@
 .\" FIXME Document CLONE_NEWUSER, which is new in 2.6.23
 .\"       (also supported for unshare()?)
 .\"
-.TH CLONE 2 2013-04-16 "Linux" "Linux Programmer's Manual"
+.TH CLONE 2 2014-01-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 clone, __clone2 \- create a child process
 .SH SYNOPSIS
@@ -1067,7 +1067,6 @@ To get the truth, it may be necessary to use code such as the following:
 .\" https://bugzilla.redhat.com/show_bug.cgi?id=417521
 .\" http://sourceware.org/bugzilla/show_bug.cgi?id=6910
 .SH EXAMPLE
-.SS Create a child that executes in a separate UTS namespace
 The following program demonstrates the use of
 .BR clone ()
 to create a child process that executes in a separate UTS namespace.
@@ -1077,7 +1076,7 @@ making it possible to see that the hostname
 differs in the UTS namespaces of the parent and child.
 For an example of the use of this program, see
 .BR setns (2).
-
+.SS Program source
 .nf
 #define _GNU_SOURCE
 #include <sys/wait.h>

man2/mmap.2

@@ -37,7 +37,7 @@
 .\" 2007-07-10, mtk, Added an example program.
 .\" 2008-11-18, mtk, document MAP_STACK
 .\"
-.TH MMAP 2 2013-04-17 "Linux" "Linux Programmer's Manual"
+.TH MMAP 2 2014-01-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 mmap, munmap \- map or unmap files or devices into memory
 .SH SYNOPSIS
@@ -639,8 +639,8 @@ The program creates a memory mapping of the required
 pages of the file and then uses
 .BR write (2)
 to output the desired bytes.
+.SS Program source
 .nf
-
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <fcntl.h>

man2/pipe.2

@@ -33,7 +33,7 @@
 .\"     to EXAMPLE text.
 .\" 2008-10-10, mtk: add description of pipe2()
 .\"
-.TH PIPE 2 2013-12-08 "Linux" "Linux Programmer's Manual"
+.TH PIPE 2 2014-01-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 pipe, pipe2 \- create pipe
 .SH SYNOPSIS
@@ -137,8 +137,8 @@ The parent then writes the string contained in the program's
 command-line argument to the pipe,
 and the child reads this string a byte at a time from the pipe
 and echoes it on standard output.
+.SS Program source
 .nf
-
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <stdio.h>

man3/ftw.3

@@ -376,8 +376,8 @@ The second command-line argument can be used to specify characters that
 control the value assigned to the \fIflags\fP
 argument when calling
 .BR nftw ().
+.SS Program source
 .nf
-
 #define _XOPEN_SOURCE 500
 #include <ftw.h>
 #include <stdio.h>

man3/mq_notify.3

@@ -23,7 +23,7 @@
 .\" the source, must acknowledge the copyright and authors of this work.
 .\" %%%LICENSE_END
 .\"
-.TH MQ_NOTIFY 3 2010-10-04 "Linux" "Linux Programmer's Manual"
+.TH MQ_NOTIFY 3 2014-01-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 mq_notify \- register for notification when a message is available
 .SH SYNOPSIS
@@ -179,8 +179,8 @@ message queue named in its command-line argument.
 Notification is performed by creating a thread.
 The thread executes a function which reads one message from the
 queue and then terminates the process.
+.SS Program source
 .nf
-
 #include <pthread.h>
 #include <mqueue.h>
 #include <stdio.h>