Add example `ronin-payloads build` commands to all `builtin/` payload's documentation

[postmodern]

Add a ## Usage section with a ronin-payloads build ... example command, showing how to build that payload, to all of the top-level documentation to all builtin/ payload classes.

• lib/ronin/payloads/builtin/cmd/awk/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/bash/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/lua/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/node/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/openssl/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/perl/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/php/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/powershell/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/python/reverse_shell.rb
• lib/ronin/payloads/builtin/cmd/ruby/reverse_shell.rb
• lib/ronin/payloads/builtin/java/reverse_shell.rb
• lib/ronin/payloads/builtin/php/cmd_exec.rb
• lib/ronin/payloads/builtin/shellcode/freebsd/x86/bind_shell.rb
• lib/ronin/payloads/builtin/shellcode/freebsd/x86/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/freebsd/x86/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/freebsd/x86_64/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/arm/bind_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/arm/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/arm/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/mips/bind_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/mips/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/mips/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/ppc/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/ppc/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/x86/bind_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/x86/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/x86/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/x86_64/bind_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/x86_64/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/linux/x86_64/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/macos/x86_64/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/macos/x86_64/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/netbsd/x86/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/netbsd/x86/reverse_shell.rb
• lib/ronin/payloads/builtin/shellcode/openbsd/x86/bind_shell.rb
• lib/ronin/payloads/builtin/shellcode/openbsd/x86/exec_shell.rb
• lib/ronin/payloads/builtin/shellcode/windows/x86_64/cmd.rb
• lib/ronin/payloads/builtin/test/open_redirect.rb
• lib/ronin/payloads/builtin/test/xss.rb