[PATCH] doc: Mention how to remove namespaces in xml->sxml.

[Richard Sent]

This documents behavior discussed in
https://lists.gnu.org/archive/html/guile-user/2024-07/msg00013.html.

* doc/ref/sxml.texi (Reading and Writing XML): Document behavior of #f
namespace prefix.
---
 doc/ref/sxml.texi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/ref/sxml.texi b/doc/ref/sxml.texi
index 003309d54..ab0b010d0 100644
--- a/doc/ref/sxml.texi
+++ b/doc/ref/sxml.texi
@@ -91,7 +91,8 @@ All namespaces in the XML document must be declared, via 
@code{xmlns}
 attributes.  SXML elements built from non-default namespaces will have
 their tags prefixed with their URI.  Users can specify custom prefixes
 for certain namespaces with the @code{#:namespaces} keyword argument to
-@code{xml->sxml}.
+@code{xml->sxml}.  A namespace can be removed by using a @code{#f} custom
+prefix.
 
 @example
 (xml->sxml "<foo xmlns=\"http://example.org/ns1\";>text</foo>")
-- 
2.45.2