Ok, don't be confused. I believe you received exact same email i got, same batch, probably same case officer. There were 5 document requested (RPRF, PCC, Schedule A, Medicals-if not completed, and passport bio page). The key message at the beginning was...."review and act IF the documents requested was not included in the original application" It also says if you've included all the documents you can disregard the email. So there are two situations
Situation 1 - You didn't include some of the documents (as is with my case), that's easy - Action required - mail the documents. In my case, the documents I needed to send were PCC, and RPRF receipt. The other 3, I had fulfilled...BUT I still updated my schedule A (because at the minimum, your last address from - to date will update to July 2015 if you fill out a Schedule A - confirming that you still have the same address as when you submitted the application. Alternatively if you've moved, you have a chance to update your latest address into the table where it asks to enter your last 10 addresses). I resent my passport bio page and for medicals, i included in the letter than I completed March 31st, and printed my ecas page showing "medicals received".
Situtaion 2 - (I guess your situation) - You've paid rprf, submitted PCC with original app etc. I still advise that you write a short letter explaining items 1,2 , 3 have been sent with the original application , include date....AND update your Schedule-A even if ONLY the change is the from-to-date on your current address (if you've not moved, the to date - will change to today's date on your last address). It also doesn't hurt to resend bio page (this is optional)