Update reactivity-utilities.md

[sombriks]

Description of Problem

small clarification on toRef

Proposed Solution

this small phrase

Additional Information

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[skirtles-code]

Thanks for the PR!

I'm afraid I don't understand this change. What do you mean by 'unless the source property is a component property'?

[sombriks]

Thanks for the PR!

I'm afraid I don't understand this change. What do you mean by 'unless the source property is a component property'?

indeed, it's too short.

since props are readonloy, the resulting ref won't be able to change original prop.

how can i make it clear?

[skirtles-code]

Ah, OK, I understand what you meant.

I've tried to clarify the impact on mutating props in #1624.