Update source-functions.md

Author: pwseg

src/connections/functions/source-functions.md

@@ -399,6 +399,6 @@ The execution time limit is five seconds, however Segment strongly recommends th
 
 Segment alphabetizes payload fields that come in to **deployed** Source Functions. Segment doesn't alphabetize payloads in the Functions tester. If you need to verify the exact payload that hits a Source Function, alphabetize it first. You can then make sure it matches what the Source Function ingests.
 
-#### Does the source function allow GET requests?
+#### Does the source function allow `GET` requests?
 
-GET requests are not supported with a source function, and the only way for the source function to receive data is through a POST request.
+`GET` requests are not supported with a source function, and the only way for the source function to receive data is through a POST request.