Proofreading: fix the version number in the web deployment example

[offray]

On page 33 of the version from October 2016, 6 (no commit number) says:

The following command will install a fresh Pharo 2.0 image together with all other files needed.

curl get.pharo.org/40+vm | bash

Make sure the VM+image combination works by asking for the image ver-
sion.

./pharo Pharo.image printVersion

[version] 4.0 #40614

It should say: "The following command will install a fresh Pharo 4.0 image..."

BTW, this book is pure joy. Is an enlighten reading and pretty well written. Thanks a lot for this.