docs: add mittalyashu as a contributor for doc (#1053)

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Author: allcontributors[bot]

.all-contributorsrc

@@ -1461,6 +1461,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "mittalyashu",
+      "name": "Yashu Mittal",
+      "avatar_url": "https://avatars.githubusercontent.com/u/29014463?v=4",
+      "profile": "https://github.com/mittalyashu",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "repoHost": "https://github.com"

README.md

@@ -323,6 +323,7 @@ Thanks goes to these people ([emoji key][emojis]):
   <tr>
     <td align="center"><a href="http://www.jacklaurence.net"><img src="https://avatars.githubusercontent.com/u/12763356?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jack Laurence</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=jacklaurencegaray" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/Lusito"><img src="https://avatars.githubusercontent.com/u/53570854?v=4?s=100" width="100px;" alt=""/><br /><sub><b>SantoJambit</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=SantoJambit" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/mittalyashu"><img src="https://avatars.githubusercontent.com/u/29014463?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Yashu Mittal</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=mittalyashu" title="Documentation">📖</a></td>
   </tr>
 </table>