docs(contrib): use consistent bullets and indentation for IDE section

[agilgur5]

Summary

Fix markdownlint issues in the "IDE Configuration" section of the CONTRIBUTING.md regarding the bullet style

Details

• per markdownlint, use one bullet style and indentation consistently

  • previously used -, *, and +, should only use one (I chose -)
  • previously used both two space and four space indents for sub-bullets, should use one consistently (I chose two space)
  • same as my other PR #402, but this one is specific to one section and with almost no other grammatical or style changes

• colon (":") instead of comma (",") for each IDE

  • this is already done for the sub-bullet sections, but was different/inconsistent for the top-level bullets

Testing done

• markdownlint no longer errors for these lines
• See the rendered markdown rich diff for this PR -- other than the colons, there are no visible changes to the rendering

Submitter checklist

• [x] Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• [x] Ensure that the pull request title represents the desired changelog entry
• [x] Please describe what you did
• [x] Link to relevant issues in GitHub or Jira
• [x] Link to relevant pull requests, esp. upstream and downstream changes
• [n/a] Ensure you have provided tests - that demonstrates feature works or fixes the issue