lib/types: Drop misleading plural from type descriptions #170561

Probably being the most prominent document demonstrating the problem,
configuration.nix(5) describes various types in plural, e.g.
- `           Type: list of strings`
- `           Type: list of systemd options`

However, there are other cases where appending "s" to the inner type
effectively changes the type, e.g.
- ```
           Type: list of string matching the pattern
           [a-zA-Z0-9@%:_.\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)s
```

This should've read "list of string[s]..." but instead changes the
regular expression.

Simply drop the best-effort plural in favour of correctness and
simplicity rather than adding more grammar related logic/trying to fix
this.

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