Doc: "Attach to Core" was renamed "Load Core File"

Change-Id: Id49bef3a8787ccc11108e2bd9e150415bfe28574
Reviewed-by: hjk <hjk121@nokiamail.com>
Doc: you cannot select a kit in the Debug menu

So, I assumed something was missing from this sentence.

Change-Id: I6758dbc57d2b3fa2befb58d19e07efe066adc43f
Reviewed-by: hjk <hjk121@nokiamail.com>