Dont escape text inside gfm code blocks

[IgnatBeresnev]

Previously it generated trailing slashes for newlines inside code blocks + performed htmlEscape() on code text, which resulted in something like this:

---

Completion of an active coroutine's body or a call to CompletableJob.complete transitions the job to the completing state. It waits in the completing state for all its children to complete before transitioning to the completed state. Note that completing state is purely internal to the job. For an outside observer a completing job is still active, while internally it is waiting for its children.

                                          wait children\
    +-----+ start  +--------+ complete   +-------------+  finish  +-----------+\
    | New | -----> | Active | ---------> | Completing  | -------> | Completed |\
    +-----+        +--------+            +-------------+          +-----------+\
                     |  cancel / fail       |\
                     |     +----------------+\
                     |     |\
                     V     V\
                 +------------+                           finish  +-----------+\
                 | Cancelling | --------------------------------> | Cancelled |\
                 +------------+                                   +-----------+

A Job instance in the coroutineContext represents the coroutine itself.