Update annotations.rst

I had some issues with the annotation because I wasn't aware that you could set both setter and getter in one annotation line.  Updating to include the setter and getter in one annotation line.

doc/reference/annotations.rst

@@ -99,7 +99,7 @@ be called to retrieve, or set the value of the given property:
     {
         private $id;
 
-        /** @Accessor(getter="getTrimmedName") */
+        /** @Accessor(getter="getTrimmedName",setter="setName") */
         private $name;
 
         // ...