Updated Domain and Mac Address docs.
Updated Domain and Mac Address docs.

Domain validator incorrectly stated that an ip would validate.  See `Respect\Validation\Rules\DomainTest`

Added second valid Mac Address format demonstration using `-`.  See `Respect\Validation\Rules\MacAddressTest`

thedavidmeister/Validation,rogeriopradoj/Validation,guilhermesiani/Validation,ahmetgunes/Validation,riyan8250/Validation,maliayas/Validation,solvire/Validation,mubassirhayat/Validation,rozehnal/Validation,Ye-Yong-Chi/Validation,hudolfhess/Validation,Whyounes/Validation,jpjoao/Validation,zinovyev/Validation,Respect/Validation,osiux/Validation,lalocespedes/Validation,mrsoto/Validation,regdos/Validation,Respect/Validation