Remove redundancy in reactivity-fundamentals.md

[sharonytlau]

Description of Problem

It also means that when we assign or destructure a reactive object's property into local variables, or when we pass that property into a function, or destructure properties from a reactive object, we will lose the reactivity connection:

In the above sentence, "or destructure properties from a reactive object" is redundant and may cause confusion.

Proposed Solution

Remove the redundancy:

It also means that when we assign or destructure a reactive object's property into local variables, or when we pass that property into a function, we will lose the reactivity connection:

It will make the explanation better match the code example.

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[skirtles-code]

Agreed, this does appear to be repeating itself. Thanks for the fix!