minor formatting fixes

[jamesfalkner]

• Text formatting issues (occasional markdown/asciidoc syntax mixups, like random asterisks and the tables with region selections have header rows that are shaded when they should not be).
• The instruction to add skipMachinePools:true results in error bar underneath it when copy/pasted, because there is a “+” where there shouldn’t be, and no space after the colon.
• Text saying "This allowed you to import an OpenShift® cluster to RHACM” is misleading since we never import any clusters - we only make new ones
• ssh instructions pointer update