US spelling Vs. British spelling

[RomainVw]

I saw in the README.rst that "When US and British spelling disagree, we opt for US spelling.".

In the "Building a network" section, "Sharing resources" section, "The IPv6 subnet" section, and "Interdomain routing" section, I noticed that both "neighbour" (British spelling) and "neighbor" (US spelling) were used.

[Peiffap]

This kind of error is actually very common throughout the whole book...