Merge pull request #822 from Darkle/patch-2

Update object.mdx

Author: fhammerschmidt

pages/docs/manual/latest/object.mdx

@@ -172,7 +172,7 @@ Since objects don't require type declarations, and since ReScript infers all the
 @val external document: 'a = "document"
 
 // call a method
-document["addEventListener"](. "mouseup", _event => {
+document["addEventListener"]("mouseup", _event => {
   Console.log("clicked!")
 })