[GRASS-dev] Help text for r.stats

[Nikos Alexandris]

One observation: `r.stats`'s `--help` returns

```
Parameters:
..
   separator   Field separator
               default: space
..
```

Shouldn't all separator options be listed here?

They are described in the `.html ` page:

```
..
separator=character
    Field separator
    Special characters: pipe, comma, space, tab, newline
    Default: space
..
```

Does this deserve a ticker?

Nikos
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