Change block-edit directive

[atd]

I was thinking on block as "block positioning", and not "forbid"

I propose switching it to something positive, "editable" for example

[atd]

@atfornes what do you think? Is it ok for you? I can change it if you agree

[atfornes]

Sure! change it as you want. If you had problems understanding it, it means that is not clear. Next time just change it and make a comment on the commit so I will notice the change.

Thanks!