docs: update .all-contributorsrc [skip ci]

.all-contributorsrc

@@ -153,7 +153,8 @@
       "avatar_url": "https://avatars.githubusercontent.com/u/3678789?v=4",
       "profile": "https://fsackur.github.io/",
       "contributions": [
-        "code"
+        "code",
+        "doc"
       ]
     }
   ],