new example - modify-subnet-attribute
remove output from commands that now return null
Fix example for describe-adjustment-types.
add frankfurt region
Merge branch 'awsdocs-new-ec2-example' into develop

* awsdocs-new-ec2-example:
  new example - modify-subnet-attribute
Merge branch 'awsdocs-autoscaling-example-update' into develop

* awsdocs-autoscaling-example-update:
  Fix example for describe-adjustment-types.
Merge branch 'awsdocs-ec2-examples-null-returns' into develop

* awsdocs-ec2-examples-null-returns:
  remove output from commands that now return null
Merge branch 'awsdocs-describe-regions' into develop

* awsdocs-describe-regions:
  add frankfurt region