Update 'Resolving close matches' content (#169)

* Update 'Resolving close matches' content

Remove content suggesting it's OK (when resolving close matches) to keep both records then archive one later. This is because users might keep 2 records for the same child, which they shouldn't do.

* Further clarifications to 'Resolving close matches'

Author: melissagraham-create

app/guide/importing-cohorts.md

@@ -168,9 +168,9 @@ Resolve close matches in the Imports area:
 You can also choose to keep both child records. For example, Mavis may identify twins as a close match. If this happens, select **Keep both records**. The existing record will stay in Mavis and the uploaded record will be added.
 
 If each record contains some correct information:
-1. Note any correct information from the record you plan to archive.
+
+1. Note any correct information from the record you are not keeping.
 2. Go to the record you are keeping and edit the information there.
-3. Archive the record you no longer need.
 
 Mavis also highlights if the NHS number you provided for a child is different from the NHS number held by PDS. If this happens, Mavis automatically replaces the incorrect NHS number with the correct one from PDS (see below).