Remove documentation about SSH and EC2 key pairs

Author: kayman-mk

README.md

@@ -150,7 +150,6 @@ After deploying this infrastructure, fill in the token manually and kill the age
 
 A few option are provided to access the runner instance:
 
-2.  Provide a EC2 key pair to access the runner by setting \`\`.
 3.  Access via the Session Manager (SSM) by setting `enable_runner_ssm_access` to `true`. The policy to allow access via SSM is not very restrictive.
 4.  By setting none of the above, no keys or extra policies will be attached to the instance. You can still configure you own policies by attaching them to `runner_agent_role_arn`.