docs: Update nx project filtering documentation

[jaytavares]

Description

require() imports no longer supported. Removed use of require() and replace with import().

Motivation and Context

Fixes #4036

Usage examples

(in updated docs)

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 change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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[escapedcat]

Thanks @jaytavares !