gnucash-docs: New annotated tag '3.906'

[John Ralls]

        at  https://github.com/Gnucash/gnucash-docs/tree/9f5f26616c97b2418944e58ee67c9c04ad81ee30 (tag)
   tagging  472668ed313330c93d2e9695ded0539e942a45d6 (commit)
  replaces  3.905
 tagged by  John Ralls
        on  Sat Jun 20 16:52:41 2020 -0700


Release Documentation for GnuCash 3.906.

Frank H. Ellenberger (4):
      Update bug URL in currently unused */it/it.po
      Remove obsolete Docbook declaration comments from docs
      Get rid of ulink type="http"
      Merge branch 'maint'

John Ralls (1):
      Release Documentation for GnuCash 3.906.