Fix misspelled "indicates"

examples/maps/maps.go

@@ -34,7 +34,7 @@ func main() {
     fmt.Println("map:", m)
 
     // The optional second return value when getting a
-    // value from a map indiciates if the key was present
+    // value from a map indicates if the key was present
     // in the map. This can be used to disambiguate
     // between missing keys and keys with zero values
     // like `0` or `""`.