Update docs on default after recent changes
Update docs on default after recent changes

`g:ale_lint_on_insert_leave` default has been changed from 0 to 1 in
168768b32667b244e0afdc8da851d91ab95d6e2f

w0rp/ale,IngoHeimbach/ale,w0rp/ale,IngoHeimbach/ale,IngoHeimbach/ale,w0rp/ale