flex-shrink docs show flex-grow classes

### Context

There's a typo in the `flex-shrink` docs.

### Related Docs

[flex-shrink docs](https://primeflex.org/flexshrink#classes)

### Related PR

https://github.com/primefaces/primeflex/pull/212

### Screenshots

![image](https://github.com/primefaces/primeflex/assets/2757601/1eda5f10-f58b-4491-95e6-d0694a8cc11b)
