Update packages/hint-no-html-only-headers/README.md

Co-Authored-By: Tony Ross <[email protected]>

Author: Jesus David García Gomez

packages/hint-no-html-only-headers/README.md

@@ -181,7 +181,7 @@ any resource whose `Content-Type` header isn't `text/html`:
                 <rule name="X-WebKit-CSP">
                     <match serverVariable="RESPONSE_X_Webkit_csp" pattern=".*" />
                     <conditions>
-                        <add input="{RESPONSE_CONTENT_TYPE}" pattern="^(text/html|text/javascript|application/pdf|image/svg+xml)" negate="true" />
+                        <add input="{RESPONSE_CONTENT_TYPE}" pattern="^(text/html|text/xml|application/xhtml+xml|text/javascript|application/pdf|image/svg+xml)" negate="true" />
                     </conditions>
                     <action type="Rewrite" value=""/>
                 </rule>