docs(polytext): update deprecation message for html_escape method

Updates the deprecation warning to recommend using html.escape directly from the html library instead of suggesting the Markup class.

This provides clearer guidance to users about the preferred alternative for HTML escaping functionality.

Author: dannystewart

src/polykit/text/polytext.py

@@ -99,7 +99,7 @@ def _escape_html(self, text: str) -> str:
     def _strip_html(self, text: str) -> str:
         return text if self != PolyText.HTML else re.sub(r"<[^>]*>", "", text)
 
-    @deprecated("Use Markup class instead.")
+    @deprecated("Use html.escape directly from the html library instead!")
     @staticmethod
     def html_escape(text: str) -> str:
         """Use the escape method directly from the HTML library."""