fix capitalization in test case

Co-Authored-By: shati-patel <42641846+shati-patel@users.noreply.github.com>

Author: erik-krogh

javascript/ql/test/query-tests/Security/CWE-834/LoopBoundInjectionExitGood.js

@@ -36,7 +36,7 @@ function throws(val) {
     }
 }
 
-// the obvious null-pointer detection should not hit this one.
+// The obvious null-pointer detection should not hit this one.
 function returns(val) {
 	var ret = [];