Fix typos in Contributing guide
Fix typos in Contributing guide

Signed-off-by: Aurélien Pupier <9fa310c88c8608d6204139bd981d00990bd6c0cd@redhat.com>
christophd/camel,adessaigne/camel,adessaigne/camel,cunningt/camel,tadayosi/camel,christophd/camel,tadayosi/camel,apache/camel,christophd/camel,apache/camel,cunningt/camel,apache/camel,cunningt/camel,apache/camel,christophd/camel,tadayosi/camel,tadayosi/camel,adessaigne/camel,apache/camel,cunningt/camel,tadayosi/camel,apache/camel,adessaigne/camel,adessaigne/camel,cunningt/camel,adessaigne/camel,tadayosi/camel,christophd/camel,cunningt/camel,christophd/camel