Fix SelectMenu width & height docs

[ibrahimpg]

Overview The width/height portion of the SelectMenu docs was simply a duplicate of the example above it about removing the title/filter. some small uniformity changes as well.

Screenshots (if applicable) Before/after

Documentation

• [ ] Updated Typescript types and/or component PropTypes
• [x] Added / modified component docs
• [ ] Added / modified Storybook stories

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