docs: update .all-contributorsrc [skip ci]

Author: allcontributors[bot]

.all-contributorsrc

@@ -2755,6 +2755,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "nchen000",
+      "name": "Nan Chen",
+      "avatar_url": "https://avatars.githubusercontent.com/u/23487984?v=4",
+      "profile": "https://www.linkedin.com/in/nan-chen-000/",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,