Update docs to reflect new iOS symupload configuration

Bug: 757455
Change-Id: I38d90de39418f4047d178b6838099a893b7c4459
Reviewed-on: https://chromium-review.googlesource.com/630247
Reviewed-by: smut <[email protected]>
Cr-Commit-Position: refs/heads/master@{#496858}
diff --git a/docs/ios/infra.md b/docs/ios/infra.md
index 80a1303d..5a350e2 100644
--- a/docs/ios/infra.md
+++ b/docs/ios/infra.md
@@ -324,7 +324,7 @@
     },
     {
       "artifact": "Chromium.breakpad",
-      "symupload": true,
+      "symupload": "https://clients2.google.com/cr/symbol",
     }
   ]
 }