firewall-commit.go build instructions incorrect

[bmigette]

Documentation link

https://registry.terraform.io/providers/PaloAltoNetworks/panos/latest/docs/guides/commits-overview

Describe the problem

The install commands given in the doc no longer work: go get is deprecated, also the firewall-commit.go script seems no longer present in repository

$ go get github.com/PaloAltoNetworks/pango
$ go build firewall-commit.go
$ mv firewall-commit ~/bin
$ firewall-commit -h

Suggested fix

update install instructions to something that works.

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