add info for MEV min-bid

[shayanb]

Adding info for min-bid for MEV-boost, what it is and how to set it.

[yorickdowne]

I don't think this is the right location to document this

[shayanb]

I don't think this is the right location to document this

I wasn't sure about where to document it tbh, where would you suggest adding it?

(fyi if this PR ethstaker/eth-docker#2262 gets merged we can include that in the MEV-Boost setup guide)

[yorickdowne]

I think it'd fit in https://ethdocker.com/Usage/Advanced/PBS

This is also a good opportunity to document the builder boost factor, just that it exists and builds local blocks if MEV doesn't pay more: E.g. for Lighthouse VC --builder-boost-factor 90 would require MEV to pay at least 10% more.

[shayanb]

The main reason I added this option to the docs (and ethstaker/eth-docker#2262) was that I wanted to set the min bid on my ethdocker setup and took me a while to find how, as no docs really talked about it.

I'll move these to the PBS section and expand the info to include the booster factor as well.

[yorickdowne]

Thank you, I appreciate the help to make the docs better and more comprehensive!