chore: v5 update Avatar docs

[nurm717123]

This pr is to update Avatar and AvatarRectangle docs to be more aligned with other existing docs.

Pull request checklist

• rename stories from Size: Small to Avatar with small size .etc
• standardize first section of mdx docs to display available props
• remove StylesOnlyUsage and ReactUsage
• use <Description /> from @storybook/blocks if necessary

updated docs:

2024-12-18.10-43-22.mov

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 2660c861	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2660c86)	Report Missing	Report Missing	Report Missing
Head commit (438d800)	4512	4054	89.85%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#262)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩

[ksolanki7]

@nurm717123 praise: Thanks for actioning the nitpicks for the stories. Just some minor polish require.

[ksolanki7]

praise: Looks good now.