Section 11.1 needs note about uncommenting line in Cargo.toml

[hodlwave]

It took me a while to debug why I wasn't able to send a single byte from the F3 to my computer (nothing showed up in minicom). The reason was that I needed to uncomment the following line Cargo.toml:

# enable this if you are going to use an external serial adapter
# features = ["adapter"]

Once I found this and uncommented the line, the example worked perfectly. I think it would be helpful if a note is added to tell the reader about this step or if the line is just uncommented in the git repo by default; I expect others to get tripped up by this.

[ytmimi]

Thank you! I ran into this exact issue and was really struggling to figure out why the example wasn't working. I totally agree that a note to the reader would be really useful!