Incorrect usage of the term "bang-pattern"

Given the following module:
```hs
module Bang where

z = let !(x,y) = (1,2) in x
```
We get the following error message:

```
Bang.hs:3:9: error:
Illegal bang-pattern (use BangPatterns):
! (x, y)
|
3 | z = let !(x,y) = (1,2) in x
| ^^^^^^
```

which is incorrect, this is a [strict binding](https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/strict.html#strict-bindings), not a bang pattern.

Suggested error message:
```
Bang.hs:3:9: error:
Illegal strict binding (use BangPatterns):
! (x, y)
|
3 | z = let !(x,y) = (1,2) in x
| ^^^^^^
```