mention sinks in changelog

Author: felickz

go/ql/lib/change-notes/2023-12-22-minor-analysis-xpath-libxml2.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* The XPath library for the XPath injection query (`go/xml/xpath-injection`) now includes support for the [libxml2](https://github.com/lestrrat-go/libxml2) package.
+* The XPath library, which is used for the XPath injection query (`go/xml/xpath-injection`), now includes support for `Parser` sinks from the [libxml2](https://github.com/lestrrat-go/libxml2) package.