Expand the introduced in filter to be more flexible

Basically, let us add any text we want between (introduced|(re)moved|deprecated) and (in|to).

I wanted to add a removal to the version history of an API setting and the version history regex was kinda limited. With this change, we'll be able to do things like:

> - The `updated_after` and `updated_before` attributes were removed and replaced
    by `finished_after` and `finished_before` respectively in GitLab 14.0.

It matches removed and in GitLab.

See gitlab!63541 (diffs).