ref(replays): add redirect for new replay count api doc (#12820)

Author: aliu39

redirects.js

@@ -729,6 +729,11 @@ const userDocsRedirects = [
     source: '/api/releases/post-release-deploys/',
     destination: '/api/releases/create-a-new-deploy-for-an-organization/',
   },
+  {
+    source: '/api/replays/retrieve-a-count-of-replays/',
+    destination:
+      '/api/replays/retrieve-a-count-of-replays-for-a-given-issue-or-transaction/',
+  },
   {
     source: '/api/projects/post-project-user-reports/',
     destination: '/api/projects/submit-user-feedback/',