Update variables.md "wins -> takes precedence"

[nboswell216]

A variable "winning" seems a little silly - stating that a variable takes precedence based on scope is generally how this concept is phrased.

[prmerger-automator[bot]]

@nboswell216 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[Jak-MS]

@juliakm Can you review the proposed changes?

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[juliakm]

#sign-off