Changes to OS.has_feature() docs:

 - Added link to the Feature Tags documentation
 - Added note that tag names are case-sensitive

doc/classes/OS.xml

@@ -508,7 +508,8 @@
 			<argument index="0" name="tag_name" type="String">
 			</argument>
 			<description>
-				Returns [code]true[/code] if the feature for the given feature tag is supported in the currently running instance, depending on platform, build etc. Can be used to check whether you're currently running a debug build, on a certain platform or arch, etc. See feature tags documentation.
+				Returns [code]true[/code] if the feature for the given feature tag is supported in the currently running instance, depending on platform, build etc. Can be used to check whether you're currently running a debug build, on a certain platform or arch, etc. Refer to the [url=https://docs.godotengine.org/en/latest/getting_started/workflow/export/feature_tags.html]Feature Tags[/url] documentation for more details.
+				Note that tag names are case-sensitive.
 			</description>
 		</method>
 		<method name="has_touchscreen_ui_hint" qualifiers="const">