Parser: Recovery in trait, eff and instance blocks is faulty.

[herluf-ba]

Essentially the same issue as #7708, but applied to trait, eff or instance blocks instead of mod blocks.
To reproduce open any of the tree block kinds and place a single doc-comment inside like so:

instance Test[Int32] {
  /// Main is missed in this example
}
def main(): Unit = ()

[magnus-madsen]

@herluf-ba Was this fixed or not yet?

[herluf-ba]

No but I made a PR now 👍