[Dialog] Fix typo and finish incomplete comment

pages/api/dialog-title.md

@@ -14,7 +14,7 @@ filename: /src/Dialog/DialogTitle.js
 |:-----|:-----|:--------|:------------|
 | children | Node |  | The content of the component. |
 | classes | Object |  | Useful to extend the style applied to components. |
-| disableTypography | boolean | false | If `true`, the children won't be wrapped by a typography component. For instance, that can be useful to can render an h4 instead of a |
+| disableTypography | boolean | false | If `true`, the children won't be wrapped by a typography component. For instance, this can be useful to render an h4 instead of the default h2. |
 
 Any other properties supplied will be [spread to the root element](/guides/api#spread).
 

src/Dialog/DialogTitle.js

@@ -42,7 +42,7 @@ export type Props = {
   className?: string,
   /**
    * If `true`, the children won't be wrapped by a typography component.
-   * For instance, that can be useful to can render an h4 instead of a
+   * For instance, this can be useful to render an h4 instead of the default h2.
    */
   disableTypography: boolean,
 };