document the fact that "Known Maximum Errors" might not be maximal

[Paul Zimmermann <Paul.Zimmermann@inria.fr>]

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   Hi,

the attached patch documents the fact that the "Known Maximum Errors" given in
the reference manual might not be maximal.

See thread starting at
https://sourceware.org/pipermail/libc-alpha/2023-December/153279.html.

Paul

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From f08ba79e35de677decef10982a8ecf5230b8456a Mon Sep 17 00:00:00 2001
From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Date: Fri, 16 Feb 2024 09:41:14 +0100
Subject: [PATCH] document the fact that "Known Maximum Errors" might not be
 maximal

---
 manual/math.texi | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/manual/math.texi b/manual/math.texi
index 2f6ee253b9..3abd83c835 100644
--- a/manual/math.texi
+++ b/manual/math.texi
@@ -1276,7 +1276,9 @@ extensions.
 @cindex ulps
 
 This section lists the known errors of the functions in the math
-library.  Errors are measured in ``units of the last place''.  This is a
+library.  However, for some functions like the Bessel functions,
+larger errors are known, but are documented elsewhere (bugzilla).
+Errors are measured in ``units of the last place''.  This is a
 measure for the relative error.  For a number @math{z} with the
 representation @math{d.d@dots{}d@mul{}2^e} (we assume IEEE
 floating-point numbers with base 2) the ULP is represented by
-- 
2.34.1