Fix FAQ: No need to delete stored emails to fix "UID validity problem"

[J]

On 17-02-14 12:52:27, Keith David Bershatsky wrote:
> All that is needed is to delete the sqlite corresponding box along with the local and remote FolderValidity boxes.  The data (which may be several gigabytes of stored emails) does not need to be deleted and re-downloaded.
> 
That sounds reasonable.
Will provide a patch in the afternoon

Greets
J