Update ports documentation to reflect renaming of FreeBSD master to main

[ericbsd]

• Updated instructions for merging FreeBSD’s repository to use main branch instead of master.
• Removed unnecessary explanatory text for resolving directory conflicts.

Summary by Sourcery

Update ports documentation to use FreeBSD’s main branch instead of master and remove outdated conflict resolution text

Documentation:

• Replace references to FreeBSD’s master branch with main in the ports tree instructions
• Remove unnecessary explanatory section on resolving directory conflicts

[sourcery-ai]

Reviewer's Guide

The PR updates the FreeBSD ports tree maintenance guide to use the renamed main branch and removes an outdated explanation on directory conflict resolution.

File-Level Changes

Change	Details	Files
Updated branch reference from master to main for FreeBSD merge instructions	Replaced merge instruction heading Swapped git merge target to freebsd/main	contributor/ports/maintaining-ports-tree.md
Removed redundant directory conflict resolution explanation	Deleted paragraph addressing directory rename/removal behavior	contributor/ports/maintaining-ports-tree.md

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[sourcery-ai]

Hey @ericbsd - I've reviewed your changes and they look great!

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