Remove empty blockquote from 02-prompt-management.md

[mattflaschen]

Purpose

Fixes a formatting error, where an empty blockquote with only the exclamation mark is shown at Develop prompt and agent versions.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[X] Documentation content changes
[ ] Other... Please describe:

What to Check

• After "Verify it’s configured to read from v1_instructions.txt.", there should no longer be an empty block with an "!" icon.