E0528 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0528.rs

E0528 needs a span_label, updating it from:

error[E0528]: pattern requires at least 3 elements but array has 2
  --> src/test/compile-fail/E0528.rs:16:10
   |
16 |         &[a, b, c, rest..] => { //~ ERROR E0528
   |          ^^^^^^^^^^^^^^^^^

To:

error[E0528]: pattern requires at least 3 elements but array has 2
  --> src/test/compile-fail/E0528.rs:16:10
   |
16 |         &[a, b, c, rest..] => { //~ ERROR E0528
   |          ^^^^^^^^^^^^^^^^^ pattern cannot match array of 2 elements