Instruction improvements

[frozenfrank]

See the detailed commit messages for a description of the changes proposed:

• db61d28 Extend code quality language improvements...
• c62e2ce Reformat and expand common Phase 4 issues...
• 1dda948 Wrap file path in backquotes to present as code...
• 5f4c6be Exclude Intelli-J's .idea folder in .gitignore