fix startsWith syntax

Author: sarahs

.github/workflows/sync-single-english-algolia-index.yml

@@ -13,7 +13,7 @@ on:
 jobs:
   updateIndices:
     name: Update English index for single version based on a label's version
-    if: github.repository == 'github/docs-internal' && github.event.label.name.startsWith('sync-english-index-for-')
+    if: github.repository == 'github/docs-internal' && startsWith(github.event.label.name, 'sync-english-index-for-')
     runs-on: ubuntu-latest
     steps:
       - name: checkout