Documentation: change "&" to "and" in Documentation/applying-patches.txt

http://english.stackexchange.com/questions/3127/when-to-use-instead-of-and

Signed-off-by: Oscar Utbult <oscar@oscr.io>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>