wait4.2, endian.3, isalpha.3, unlocked_stdio.3: Minor consistency fix…

… for Feature Test Macro info

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

man2/wait4.2

@@ -57,7 +57,7 @@ Feature Test Macro Requirements for glibc (see
     Since glibc 2.26:
         _DEFAULT_SOURCE ||
         (_XOPEN_SOURCE\ >=\ 500 &&
-                ! (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600))
+            ! (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600))
     From glibc 2.19 to 2.25:
         _DEFAULT_SOURCE || _XOPEN_SOURCE\ >=\ 500
     Glibc 2.19 and earlier:

man3/endian.3

@@ -53,6 +53,7 @@ convert values between host and big-/little-endian byte order
 .RS -4
 Feature Test Macro Requirements for glibc (see
 .BR feature_test_macros (7)):
+.ad l
 .RE
 .PP
 .BR htobe16 (),
@@ -73,6 +74,7 @@ Feature Test Macro Requirements for glibc (see
     In glibc up to and including 2.19:
         _BSD_SOURCE
 .fi
+.ad
 .SH DESCRIPTION
 These functions convert the byte encoding of integer values from
 the byte order that the current CPU (the "host") uses,

man3/isalpha.3

@@ -87,6 +87,7 @@ _XOPEN_SOURCE
 .RS 4
 _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
 .RE
+.nh
 .PP
 .BR isalnum_l (),
 .BR isalpha_l (),
@@ -100,6 +101,7 @@ _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
 .BR isspace_l (),
 .BR isupper_l (),
 .BR isxdigit_l ():
+.hy
 .PD 0
 .RS 4
 .TP

man3/unlocked_stdio.3

@@ -66,6 +66,7 @@ putchar_unlocked \- nonlocking stdio functions
 Feature Test Macro Requirements for glibc (see
 .BR feature_test_macros (7)):
 .ad l
+.nh
 .RE
 .PP
 .BR getc_unlocked (),
@@ -104,6 +105,7 @@ Feature Test Macro Requirements for glibc (see
 .RS 4
 _GNU_SOURCE
 .RE
+.hy
 .ad b
 .SH DESCRIPTION
 Each of these functions has the same behavior as its counterpart