clock_getres.2, fsync.2, mlock.2, mmap.2, msync.2, INFINITY.3, cexp2.3, clog2.3, flockfile.3: Remove AVAILABILITY section heading

In the few pages where this heading (which is "nonstandard" within
man-pages) is used, it always immediately follows CONFORMING TO
and generally contains information related to standards. Remove
the section heading, thus incorporating AVAILABILITY into
CONFORMING TO.

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

man2/clock_getres.2

@@ -349,7 +349,7 @@ T}	Thread safety	MT-Safe
 .sp 1
 .SH CONFORMING TO
 POSIX.1-2001, POSIX.1-2008, SUSv2.
-.SH AVAILABILITY
+.PP
 On POSIX systems on which these functions are available, the symbol
 .B _POSIX_TIMERS
 is defined in \fI<unistd.h>\fP to a value greater than 0.

man2/fsync.2

@@ -151,7 +151,7 @@ system call, and some previous write failed due to insufficient
 storage space.
 .SH CONFORMING TO
 POSIX.1-2001, POSIX.1-2008, 4.3BSD.
-.SH AVAILABILITY
+.PP
 On POSIX systems on which
 .BR fdatasync ()
 is available,

man2/mlock.2

@@ -275,7 +275,7 @@ POSIX.1-2001, POSIX.1-2008, SVr4.
 .PP
 .BR mlock2 ()
 is Linux specific.
-.SH AVAILABILITY
+.PP
 On POSIX systems on which
 .BR mlock ()
 and

man2/mmap.2

@@ -655,7 +655,7 @@ T}	Thread safety	MT-Safe
 POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD.
 .\" SVr4 documents additional error codes ENXIO and ENODEV.
 .\" SUSv2 documents additional error codes EMFILE and EOVERFLOW.
-.SH AVAILABILITY
+.PP
 On POSIX systems on which
 .BR mmap (),
 .BR msync (2),

man2/msync.2

@@ -105,7 +105,7 @@ instead of
 .BR ENOMEM .
 In Linux 2.4.19, this was changed to the POSIX value
 .BR ENOMEM .
-.SH AVAILABILITY
+.PP
 On POSIX systems on which
 .BR msync ()
 is available, both

man3/INFINITY.3

@@ -73,7 +73,7 @@ respectively,
 that represent a large positive value, possibly positive infinity.
 .SH CONFORMING TO
 C99.
-.SH AVAILABILITY
+.PP
 On a glibc system, the macro
 .B HUGE_VAL
 is always available.

man3/cexp2.3

@@ -22,7 +22,7 @@ The function returns 2 raised to the power of
 .IR z .
 .SH CONFORMING TO
 These function names are reserved for future use in C99.
-.SH AVAILABILITY
+.PP
 As at version 2.31, these functions are not provided in glibc.
 .\" But reserved in NAMESPACE.
 .SH SEE ALSO

man3/clog2.3

@@ -33,7 +33,7 @@ Note that
 close to zero will cause an overflow.
 .SH CONFORMING TO
 These function names are reserved for future use in C99.
-.SH AVAILABILITY
+.PP
 Not yet in glibc, as at version 2.19.
 .\" But reserved in NAMESPACE.
 .SH SEE ALSO

man3/flockfile.3

@@ -139,7 +139,7 @@ T}	Thread safety	MT-Safe
 .TE
 .SH CONFORMING TO
 POSIX.1-2001, POSIX.1-2008.
-.SH AVAILABILITY
+.PP
 These functions are available when
 .B _POSIX_THREAD_SAFE_FUNCTIONS
 is defined.