minor update manual

[leousr123]

Hi,

In the manual (.doc), in par 2.1:
"apt-get install build-essentials libpcap-dev"

should maybe be:
"apt-get install build-essentials libpcap-dev clang llvm"

...?

[leousr123]

At page 29:
secret "7zTrFAk8z5YP2IaHNdy0ig=="
should probably be
secret "7zTrFAk8z5YP2IaHNdy0ig==";