add a bulletpoint to add user to group in part-one
fix link to CloudFormation documentation in part-two
Merge pull request #1 from flosell/add-to-groups-fix

Add a bullet point to add user to group in part-one
Merge pull request #2 from flosell/link-fixes

Fix link to CloudFormation documentation in part-two
Minor formatting and grammar changes
Clarified some instructions and tidied up the grammar in places.
Minor formatting and capitalisation changes.
More capitalisation changes.
Changed AWS CLI set up instructions to use 'aws configure' tool rather than a manually-created text file.
Minor formatting and grammar changes.
Tidied up heading hierarchy.
Fixed link to CloudFormation template documentation.
Merge pull request #5 from charleskorn/master

Minor formatting and grammar changes and clarifications for parts 1 and 2
Add region disclaimer
Fix minor spelling error
Fix up region specific text
Fix #3 with updated AMI ids