Kea User's Guide table listing standard options uses "hex" instead of "binary"

It was reported that Type column in Table 8.1. List of standard DHCPv4 options uses hex instead of binary for options which are specified as a string of hexadecimal digits. The correct name is binary. Also, additional two issues were found:

• option 60 (vendor-class-identifier) is listed as "hex" but in fact it is a "string"
• option 124 (vivco-suboptions) should probably come with an example