Feat: update mentions of backticks in playbook docs.

[evan-gravwell]

This PR relates to:

• Playbooks: avoid single backticks while intending to provide launchable queries. kits#292
• https://github.com/gravwell/issues/issues/2317

This PR proposes...

• Removing mentions of single backticks rendering launchable queries.
  • Single backticks are now used for the standard markdown behavior of rendering inline monospace text.

PR Tasks

• e2e and/or unit tests included. If not, please provide an explanation.
• Bug fixes only: minimal repro steps included on the issue (for PR QA + Release QA).

Reviewer Tasks

• e2e or unit tests are present to test the proposed changes.
• Code is sufficiently documented.
• Code meets quality and correctness expectations.

[kris-watts-gravwell]

LGTM