manual: Provide consistent errno documentation.

The @errno macro is extended to render the canonical error string in
every documented errno error.  Redundant entries and "???" are
removed.  Sixty-six errors now at least contain the error string as
the description, where no description (or "???") existed before.

	* manual/errno.texi: Remove redundant error strings.
	* manual/macros.texi (@errno): Render the error string in
	every description.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 8495478..3ac07f0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-06-02  Rical Jasan  <ricaljasan@pacific.net>
+
+	* manual/errno.texi: Remove redundant error strings.
+	* manual/macros.texi (@errno): Render the error string in every
+	description.
+
 2017-06-02  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #21543]