Various text edits needed in BIND ARM

Various bits of text need some rewording, starting with:

2.1. Hardware Requirements DNS hardware requirements have traditionally been quite modest. For many installations, servers that have been pensioned off from active duty have performed admirably as DNS servers.

The DNSSEC features of BIND 9 may prove to be quite CPU intensive however, so organizations that make heavy use of these features may wish to consider larger systems for these applications. BIND 9 is fully multithreaded, allowing full utilization of multiprocessor systems for installations that need it.

3.2 Load Balancing [...] For more detail on ordering responses, check the rrset-order sub-statement in the options statement, see RRset Ordering.