Adding note to IP filter docs to warn about some filters being inherited (#68955)

Adding a note to IP filter docs to warn that transport filters are inherited to http filters.
Might be worth to also note that this behavior is not the same for http -> transport

fixes #41790

Co-authored-by: James Rodewig <[email protected]>

Author: jakommo

x-pack/docs/en/security/using-ip-filtering.asciidoc

@@ -23,6 +23,9 @@ You configure IP filtering by specifying the `xpack.security.transport.filter.al
 `xpack.security.transport.filter.deny` settings in in `elasticsearch.yml`. Allow rules
 take precedence over the deny rules.
 
+IMPORTANT: Unless explicitly specified, `xpack.security.http.filter.*` settings default to
+the corresponding `xpack.security.transport.filter.*` setting's value.
+
 [source,yaml]
 --------------------------------------------------
 xpack.security.transport.filter.allow: "192.168.0.1"