Update web-setup.md

Author: pwseg

src/connections/auto-instrumentation/web-setup.md

@@ -214,7 +214,7 @@ After integrating the SDK and running your app, verify that Segment is collectin
 
 #### Enable debug mode
 
-User activity is not collected by default after SDK installation. To collect activity for use in building event rules, append the segment_signals_debug=true URL parameter.
+User activity is not collected by default after SDK installation. To collect activity for use in building event rules, append the `segment_signals_debug=true` URL parameter.
 
 ```
 https://my-website.com?segment_signals_debug=true