Tips-N'-Trick: add a tip to use switch.
Tips-N'-Trick: add a tip to use switch.

I find brew switch very helpful to activate a different version of an
installed formula. This seems worth calling out in the documentation to
elevate awareness.

Closes Homebrew/homebrew#45694.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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