Add Tooltip for Local Routing Switch in Swap Settings

[Jdecristi]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the solution you'd like I'd be nice to have a tooltip for "Local routing" in the swap settings that describes what local routing does. It could be like the tooltips for "Max slippage" or "Transaction deadline"

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