Update en.json

docs/en/en.json

@@ -1552,7 +1552,7 @@
                         "name": "Debugging"
                     },
                     {
-                        "path": "/manuals/extensions-ext-manifest",
+                        "path": "/manuals/extensions-ext-manifests",
                         "name": "Extension Manifests"
                     },
                     {