core: typo fix

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.28.47",
+    "version": "2.28.48",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",

packages/hydrooj/src/handler/homework.ts

@@ -169,7 +169,7 @@ class HomeworkDetailProblemHandler extends Handler {
         // e.g. ![img](a.jpg) will navigate to ![img](./pid/file/a.jpg)
         this.response.body.pdoc.content = this.response.body.pdoc.content
             .replace(/\(file:\/\//g, `(./${pid}/file/`)
-            .reaplce(/="file:\/\//g, `="./${pid}/file/`);
+            .replace(/="file:\/\//g, `="./${pid}/file/`);
     }
 }