A few "a->an" and "an->a".
"Shows, if the supplied default SOCKS5 proxy" -> "Shows if the supplied
default SOCKS5 proxy". Change made on 3 occurrences.
"without fully understanding the ramification of a command" -> "without
fully understanding the ramifications of a command".
Removed duplicate words such as "the the".

make check
./test/functional/test_runner.py wallet_hd