plugin devs can't be relied on to pass the proper types to these APIs, and when the wrong types get passed it makes type errors appear from inside the internals.
* Utils: fix parsing of single-line doc comments, closes#3388
* correctly handle the empty doc-comment case, add another test case
* ignore an extra phpstan bug
this isn't required by the spec and PHPStan chokes on it. I was previously having it ignore these errors, but it turns out that PHPStan is not making use of extended typeinfo provided if it can't parse the tag, which is problematic on level 6 and also a problem for array-of-type. Therefore, we are going to have to take the hit.
