doc: Add references to FreeBSD bugs

[Bruno Haible]

For keeping track of open FreeBSD bugs:


2023-08-03  Bruno Haible  <bruno@clisp.org>

        doc: Add references to FreeBSD bugs.
        * doc/posix-functions/fnmatch.texi: Add commented reference to FreeBSD
        bug.
        * doc/posix-functions/wcscmp.texi: Likewise.
        * doc/posix-functions/wcsncmp.texi: Likewise.

diff --git a/doc/posix-functions/fnmatch.texi b/doc/posix-functions/fnmatch.texi
index 1e662a43c1..538d73a9fc 100644
--- a/doc/posix-functions/fnmatch.texi
+++ b/doc/posix-functions/fnmatch.texi
@@ -82,7 +82,9 @@
 @c Failing test cases:
 @c fnmatch ("[[:alnum:]]", "a", 0) == 0
 @c etc.
-FreeBSD 13.2, NetBSD 9.3, Cygwin 3.4.6.
+@c https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=57911
+FreeBSD 13.2,
+NetBSD 9.3, Cygwin 3.4.6.
 @item
 In the pattern, character classes (such as @code{[:alnum:]}) inside
 bracket expressions fail to match characters outside the single-byte
diff --git a/doc/posix-functions/wcscmp.texi b/doc/posix-functions/wcscmp.texi
index 2ce58db350..22d9060d34 100644
--- a/doc/posix-functions/wcscmp.texi
+++ b/doc/posix-functions/wcscmp.texi
@@ -11,7 +11,10 @@
 @item
 This function compares the wide characters as if they were unsigned, although
 @code{wchar_t} is signed, on some platforms:
-glibc 2.14.1 on x86 or x86_64, musl libc 1.2.3, macOS 12.5, FreeBSD 13.2, 
NetBSD 9.0, OpenBSD 7.2, Solaris 11.4.
+glibc 2.14.1 on x86 or x86_64, musl libc 1.2.3, macOS 12.5,
+@c https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272914
+FreeBSD 13.2,
+NetBSD 9.0, OpenBSD 7.2, Solaris 11.4.
 @item
 This function may return a wrong result if the two arguments are of different
 length, on some platforms:
diff --git a/doc/posix-functions/wcsncmp.texi b/doc/posix-functions/wcsncmp.texi
index 46874af46f..4fd90ba95c 100644
--- a/doc/posix-functions/wcsncmp.texi
+++ b/doc/posix-functions/wcsncmp.texi
@@ -11,7 +11,10 @@
 @item
 This function compares the wide characters as if they were unsigned, although
 @code{wchar_t} is signed, on some platforms:
-glibc 2.14.1 on x86 or x86_64, musl libc 1.2.3, macOS 12.5, FreeBSD 13.2, 
NetBSD 9.0, OpenBSD 7.2, Solaris 11.4.
+glibc 2.14.1 on x86 or x86_64, musl libc 1.2.3, macOS 12.5,
+@c https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272915
+FreeBSD 13.2,
+NetBSD 9.0, OpenBSD 7.2, Solaris 11.4.
 @item
 This function may return a wrong result if the two arguments are of different
 length, on some platforms: