Use documentation range IP-addresses in RPKI code comments

[bwbroersma]

Currently not using the documentation IP ranges:

Internet.nl/checks/tasks/rpki.py

Lines 256 to 261 in 0e5a6d1

	# Provide tech_data to generate a table of the following form
	#
	# Server | IP address | ROA exists
	# -------------------------------------
	# example.nl | 192.168.0.1 | yes
	# example.nl | 192.168.0.2 | no

Internet.nl/checks/tasks/rpki.py

Lines 312 to 318 in 0e5a6d1

	# Provide tech_data to generate a table of the following form
	#
	# Server | Route | Origin | Validation state
	# --------------------------------------------------------
	# example.nl | 192.168.0.0/16 | AS64496 | valid
	# example.nl | 192.168.0.0/26 | AS64497 | invalid
	# example.nl | 10.0.0.0/8 | ? | not-tested

See the IANA reserved ranges for 'Documentation' that are used elsewhere in the code / documentation:
https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
and
https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml