[PATCH] manual: Provide consistent errno documentation.

[Rical Jasan]

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.
---
 manual/errno.texi  | 66 ++++++++++++++++++++++++------------------------------
 manual/macros.texi |  1 +
 2 files changed, 30 insertions(+), 37 deletions(-)

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