Fix typo in docker documentation.
Fix typo in docker documentation.

flamingspaz/remo,tsmrachel/remo,tsmrachel/remo,akatsoulas/remo,mozilla/remo,flamingspaz/remo,Mte90/remo,akatsoulas/remo,flamingspaz/remo,Mte90/remo,tsmrachel/remo,mozilla/remo,akatsoulas/remo,flamingspaz/remo,Mte90/remo,tsmrachel/remo,Mte90/remo,mozilla/remo,akatsoulas/remo,mozilla/remo