Clean up and reorder AWS EB install steps (#11050)

* clean up and reorder install steps [ci skip]

* correct the upload-your-code instructions [ci skip]

* Correct suggested value for "availability"

* Fix bullets and quoting

* Add periods at end of sentences

* Fix grammar and capitalization

* Specify config blocks that options are from

* Align emphasis of "NOTE" lines

* Fix more bullets

* Fix one more NOTE

* some small tweaks and screenshot updates [ci skip]