Update README.md

Grammatical fixes.

middleware/loadbalance/README.md

 # loadbalance
 
-`loadbalance` acts as a round-robin DNS loadbalancer by randomizing A and AAAA records in the
-message. See [Wikipedia](https://en.wikipedia.org/wiki/Round-robin_DNS) about the pros and cons
+`loadbalance` acts as a round-robin DNS loadbalancer by randomizing the order of A and AAAA records in the answer. See [Wikipedia](https://en.wikipedia.org/wiki/Round-robin_DNS) about the pros and cons
 on this setup.
 
 It will take care to sort any CNAMEs before any address records, because some stub resolver
-implementation (like glibc) can't handle that.
+implementations (like glibc) are particular about that.
 
 ## Syntax