docs: Fix formatting due to unclosed backtick

Google APIs · copybara-github · commit 6c31cc0071cc · 2024-01-12T13:46:05.000-08:00
PiperOrigin-RevId: 597942027
diff --git a/google/firestore/admin/v1/firestore_admin.proto b/google/firestore/admin/v1/firestore_admin.proto
@@ -164,7 +164,7 @@ service FirestoreAdmin {
   // only supports listing fields that have been explicitly overridden. To issue
   // this query, call
   // [FirestoreAdmin.ListFields][google.firestore.admin.v1.FirestoreAdmin.ListFields]
-  // with the filter set to `indexConfig.usesAncestorConfig:false or
+  // with the filter set to `indexConfig.usesAncestorConfig:false` or
   // `ttlConfig:*`.
   rpc ListFields(ListFieldsRequest) returns (ListFieldsResponse) {
     option (google.api.http) = {
