oops fix typo

Signed-off-by: Michael Demmer <mdemmer@slack-corp.com>

go/flags/endtoend/vtgate.txt

@@ -30,7 +30,8 @@ Flags:
  --alsologtostderr log to standard error as well as files
  --balancer_enabled Whether to enable the tablet balancer to evenly spread query load
  --balancer_keyspaces strings When in balanced mode, a comma-separated list of keyspaces for which to use the balancer (optional)
- --balancer_vtgate_cells strings When in balanced mode, a comma-separated list of cells that contain vtgates (required) --bind-address string Bind address for the server. If empty, the server will listen on all available unicast and anycast IP addresses of the local system.
+ --balancer_vtgate_cells strings When in balanced mode, a comma-separated list of cells that contain vtgates (required)
+ --bind-address string Bind address for the server. If empty, the server will listen on all available unicast and anycast IP addresses of the local system.
  --buffer_drain_concurrency int Maximum number of requests retried simultaneously. More concurrency will increase the load on the PRIMARY vttablet when draining the buffer. (default 1)
  --buffer_keyspace_shards string If not empty, limit buffering to these entries (comma separated). Entry format: keyspace or keyspace/shard. Requires --enable_buffer=true.
  --buffer_max_failover_duration duration Stop buffering completely if a failover takes longer than this duration. (default 20s)