Markdown parsing issues

Looks like this is 8.8 regression.

I tried to write Introduc_ed_, but Gitlab failed to properly parse it.

But Introduced a bug works.

So here is list what:

• Works:

  • Introduced a bug

  **Introduced a _bug_**

• Does not work:

  • Introduc_ed_
  • Introduc__ed__
  • Introduc__ed__

  **Introduc_ed_**
  **Introduc__ed__**
  Introduc__ed__