Remove a section that's 1. buggy and 2. controversial

[dead-claudia]

Description

Remove the "Avoid Restrictive Interfaces" section

Motivation and Context

See discussion in #2250 and #1986 for more details.

Fixes #1986

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)
• Documentation 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.
• I have updated docs/change-log.md