Description fixes and rephrasals for ivyfeatures

[nvllz]

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• I've read the Contribution Guidelines and my PR doesn't break the rules.
• I've read and understand the Developer Guidelines.
• I confirm that I've run the code locally and everything works as expected.
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What's changed?

Describe with a few bullets what's new:

• improved descriptions for several ivyfeatures

Does this PR close any GitHub issues? (do not delete)

• Closes N/A

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