Fix typo noticed during demo in explanation of fees on txn send

[EvanJRichard]

youe -> your is the main thing I want to fix, but while I was in there, I edited the grammar of that message slightly.

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Name	Status	Preview	Comments	Updated (UTC)
wallet-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2023 9:09pm