STYLE "wrongplaced whitespace" rule doesn't error on its example of a bad string
The docstring reads

https://github.com/pandas-dev/pandas/blob/9ab55b4aed9018b070c939ffbdf232f99bf50f1a/scripts/validate_unwanted_patterns.py#L355-L361

yet this file doesn't error if the script is run on it:
```console
$ cat t.py 
rule = (
   "We want the space at the begging of "
   "the line if the previous line is ending with a \n "
   "not at the end, like always"
)
$ python scripts/validate_unwanted_patterns.py -vt 'strings_with_wrong_placed_whitespace' t.py 
```

Some other files which don't error, though I can't understand why:
```console
$ cat t.py 
rule = (
   "  We want the space at the begging of"
   " the line if the previous line is ending with a \n "
   "not at the end, like always"
)
$ python scripts/validate_unwanted_patterns.py -vt 'strings_with_wrong_placed_whitespace' t.py 
```

```console
$ cat t.py 
rule = (
   "We want the space at the begging of"
   " the line if the previous line is ending with a  "
   "not at the end, like always"
)
$ python scripts/validate_unwanted_patterns.py -vt 'strings_with_wrong_placed_whitespace' t.py
```

Hi @ShaharNaveh @datapythonista - do you have any context you could provide on the trailing newline rule? I'm struggling to make sense of it - thanks :) 