docs(bootstrap): Add note about --hoist incompatibility with file: specifiers

[bwhitty]

Description

Just a note about incompatibilities with bootstrap --hoist and file: specifiers

Motivation and Context

Based on #1679 (comment)

How Has This Been Tested?

n/a

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[evocateur]

Thanks for your patience!