Added PPP directory to astyle ignore and added some spellchecker ignore words

Author: Mika Leppänen

.astyleignore

@@ -16,6 +16,9 @@
 ^features/nanostack/sal-stack-nanostack
 ^features/nanostack/targets
 ^features/netsocket/emac-drivers
+^features/netsocket/ppp/include
+^features/netsocket/ppp/polarssl
+^features/netsocket/ppp/source
 ^features/storage/filesystem/fat/ChaN
 ^features/storage/filesystem/littlefs/littlefs/
 ^features/unsupported/

tools/test/travis-ci/doxy-spellchecker/ignore.en.pws

@@ -100,4 +100,13 @@ UDPSocket
 Socket
 unregister
 deinit
+auth
+pppapi
+pbuf
+nak
+reqs
+xmit
+pppd
+pppdebug
+ppp
 _doxy_