Two small comment updates to make them more clear.

Side-Note: I tried to undo the previous commit to avoid such a small change requiring a full commit, but it didn't work as expected. Anyway, ignore the duplicate commit (probably just before this one)... They all should work though. Sorry for the messy commit history.

lib/mail/mail.rb

@@ -147,7 +147,7 @@ def self.find(*args, &block)
     retriever_method.find(*args, &block)
   end
 
-  # Finds and the deletes found emails from a POP3 server.
+  # Finds and then deletes retrieved emails from a POP3 server.
   # See Mail::POP3 for a complete documentation.
   def self.find_and_delete(*args, &block)
     retriever_method.find_and_delete(*args, &block)