reth book: add instruction to update rust version #10308
Merged
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I was following the book to build reth, but I got error
then I found the GH README mentioned "The Minimum Supported Rust Version (MSRV) of this project is 1.80.0." but this is not in the book.
So I am adding it to the book to keep consistent. Also add the instructions for checking and updating rust version
Note: the trouble shooting section briefly mentioned if there is compile error, you can upgrade rust. but I think it's better to avoid such error in the first place.