fix typo

Co-authored-by: Mattie Fu <mattiefu@google.com>

Author: daniel-sanche

.github/workflows/conformance.yaml

@@ -32,7 +32,7 @@ jobs:
             # sync client does not support concurrent streams
             test_args: "-skip _Generic_MultiStream"
           - client-type: "legacy"
-            # legacy client is synchtonous and does not support concurrent streams
+            # legacy client is synchronous and does not support concurrent streams
             # legacy client does not expose mutate_row. Disable those tests
             test_args: "-skip _Generic_MultiStream -skip TestMutateRow_"
       fail-fast: false