fix typos (#42)

Author: dilyanpalauzov

src/pages/docs/v2/constructors.mdx

@@ -203,7 +203,7 @@ instance.setOptions(options => ({
      ...options.modifiers,
      { name: 'eventListeners', enabled: false }
   ]
-});
+}));
 ```
 
 ```js

src/pages/docs/v2/modifiers/index.mdx

@@ -18,7 +18,7 @@ adding functionality, hence the term "modifiers".
 
 ## Custom Modifiers
 
-Is it possible to add custom modifiers, written by you, by defining them in the
+It is possible to add custom modifiers, written by you, by defining them in the
 `options.modifiers` array during a Popper instantation.
 
 ### Example modifier