docs: add tku137 as a contributor for doc (#727)

Author: allcontributors[bot]

.all-contributorsrc

@@ -318,7 +318,7 @@
       "name": "Tony Fischer",
       "avatar_url": "https://avatars.githubusercontent.com/u/3052212?v=4",
       "profile": "https://github.com/tku137",
-      "contributions": ["code"]
+      "contributions": ["code", "doc"]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -811,7 +811,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/abdennourzahaf"><img src="https://avatars.githubusercontent.com/u/62243290?v=4?s=100" width="100px;" alt="abdennourzahaf"/><br /><sub><b>abdennourzahaf</b></sub></a><br /><a href="https://github.com/CopilotC-Nvim/CopilotChat.nvim/commits?author=abdennourzahaf" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/josiahdenton"><img src="https://avatars.githubusercontent.com/u/44758384?v=4?s=100" width="100px;" alt="Josiah"/><br /><sub><b>Josiah</b></sub></a><br /><a href="https://github.com/CopilotC-Nvim/CopilotChat.nvim/commits?author=josiahdenton" title="Code">💻</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/tku137"><img src="https://avatars.githubusercontent.com/u/3052212?v=4?s=100" width="100px;" alt="Tony Fischer"/><br /><sub><b>Tony Fischer</b></sub></a><br /><a href="https://github.com/CopilotC-Nvim/CopilotChat.nvim/commits?author=tku137" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/tku137"><img src="https://avatars.githubusercontent.com/u/3052212?v=4?s=100" width="100px;" alt="Tony Fischer"/><br /><sub><b>Tony Fischer</b></sub></a><br /><a href="https://github.com/CopilotC-Nvim/CopilotChat.nvim/commits?author=tku137" title="Code">💻</a> <a href="https://github.com/CopilotC-Nvim/CopilotChat.nvim/commits?author=tku137" title="Documentation">📖</a></td>
     </tr>
   </tbody>
 </table>