doc: Fix object literal syntax in set.md

MosheAtOwal · web-flow · commit be7b5add1203 · 2018-07-30T15:40:36.000-04:00
diff --git a/docs/set.md b/docs/set.md
@@ -9,7 +9,7 @@ this.$ga.set(fieldName, fieldValue)
 also possible to pass an object literal
 
 ```js
-this.$ga.set({ fieldName, fieldValue })
+this.$ga.set({ fieldName: fieldValue })
 ```
 
 ### Set multiple fields before first hit
