[PATCH] Update some POSIX.1-2004 citations

[Paul Eggert]

---
 doc/pastposix-functions/usleep.texi | 2 +-
 doc/posix-headers/sys_timeb.texi    | 3 ++-
 doc/posix-headers/ucontext.texi     | 3 ++-
 lib/unistd.in.h                     | 2 +-
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/doc/pastposix-functions/usleep.texi 
b/doc/pastposix-functions/usleep.texi
index 1b31865a09..1a06d2b80f 100644
--- a/doc/pastposix-functions/usleep.texi
+++ b/doc/pastposix-functions/usleep.texi
@@ -3,7 +3,7 @@
 @findex usleep
 
 Removed in POSIX.1-2008.
-POSIX.1-2004 specification: 
@url{https://pubs.opengroup.org/onlinepubs/009695399/functions/usleep.html}
+POSIX.1-2004 specification:@* 
@url{https://pubs.opengroup.org/onlinepubs/009695399/functions/usleep.html}
 
 Gnulib module: usleep
 @mindex usleep
diff --git a/doc/posix-headers/sys_timeb.texi b/doc/posix-headers/sys_timeb.texi
index 3cc2939526..ad6bb568c2 100644
--- a/doc/posix-headers/sys_timeb.texi
+++ b/doc/posix-headers/sys_timeb.texi
@@ -1,7 +1,8 @@
 @node sys/timeb.h
 @section @file{sys/timeb.h}
 
-POSIX specification:@* 
@url{https://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/timeb.h.html}
+Removed in POSIX.1-2008.
+POSIX.1-2004 specification:@* 
@url{https://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/timeb.h.html}
 
 Gnulib module: ---
 
diff --git a/doc/posix-headers/ucontext.texi b/doc/posix-headers/ucontext.texi
index bfdaa921fc..dd550bd714 100644
--- a/doc/posix-headers/ucontext.texi
+++ b/doc/posix-headers/ucontext.texi
@@ -1,7 +1,8 @@
 @node ucontext.h
 @section @file{ucontext.h}
 
-POSIX specification:@* 
@url{https://pubs.opengroup.org/onlinepubs/009695399/basedefs/ucontext.h.html}
+Removed in POSIX.1-2008.
+POSIX.1-2004 specification:@* 
@url{https://pubs.opengroup.org/onlinepubs/009695399/basedefs/ucontext.h.html}
 
 Gnulib module: ---
 
diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index 56cc84f379..c135a770dc 100644
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -2420,7 +2420,7 @@ _GL_WARN_ON_USE (unlinkat, "unlinkat is not portable - "
 #if @GNULIB_USLEEP@
 /* Pause the execution of the current thread for N microseconds.
    Returns 0 on completion, or -1 on range error.
-   See the POSIX:2001 specification
+   See the POSIX.1-2004 specification
    <https://pubs.opengroup.org/onlinepubs/009695399/functions/usleep.html>.  */
 # if @REPLACE_USLEEP@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
-- 
2.48.1