Typos in tutorials

[kerimoyle]

• Tutorial 1: 2.f missing in cpp file
• Tutorial 1: 3.c should read "serialise" not "deserialise"
• Tutorial 2, 2.c : "Now we need to create an iterative loop to retrieve all (and there should be a few in this particular model!) from the validator." missing "errors"

[straaljager]

Tutorial 2, 2.c: missing "errors"?
"Now we need to create an iterative loop to retrieve all (and there should be a few in this particular model!) from the validator."