Update Documentation

[bsieber-mozilla]

          This looks sound.

There are other bits of the README that can be slightly inaccurate like:

• The system sets the see_also field of the Bugzilla bug with the URL to the Jira issue: this is now a possible step instead of a systematic behavior
• some missing comma in the allow_private parameter description
• In the **Parameters** section, the default values are not specified consistently
• Missing new line before ### Available Steps

Originally posted by @leplatrem in #380 (review)

[bsieber-mozilla]

#380 (comment)

>     The system sets the see_also field of the Bugzilla bug with the URL to the Jira issue: this is now a possible step instead of a systematic behavior

@leplatrem if the setting of the `see_also` is optional, how are we planning to "link" bugs instead of making dupes each time? 

_It is my understanding that the see_also is the only connection to the downstream link_

>     - some missing comma in the allow_private parameter description
>     - In the **Parameters** section, the default values are not specified consistently
>     - Missing new line before ### Available Steps

I'll take a look to update these as well--thanks for the callouts

[AshitaSingamsetty]

I will work on this and submit a PR later.