mongo-sync: Do not mention mongo_sync_unix_connect
mongo-sync: Do not mention mongo_sync_unix_connect

The mongo_sync_unix_connect() function never existed, do not mention
it.

Signed-off-by: Gergely Nagy <6780fac3b38619ac20422286e4110a70dbba2203@madhouse-project.org>

algernon/libmongo-client,algernon/libmongo-client,algernon/libmongo-client