Markdown: some spans have incorrect ranges

[artempyanykh]

It looks like some spans have incorrect ranges. The repro is here.

Note that the actual range for " After" span is (1,7)-(1,13), while I'd expect it to be (1,21)-(1,27).

//                   1         2
//         0123456789012345678901234567
let doc = "Before [indirectLink] After" |> Markdown.Parse
-----
Expected: [Paragraph
   ([Literal ("Before", Some { StartLine = 1
                               StartColumn = 0
                               EndLine = 1
                               EndColumn = 7 });
     IndirectLink
       ([Literal ("indirectLink", Some { StartLine = 1
                                         StartColumn = 8
                                         EndLine = 1
                                         EndColumn = 20 })], "", "indirectLink",
        Some { StartLine = 1
               StartColumn = 7
               EndLine = 1
               EndColumn = 21 }); Literal (" After", Some { StartLine = 1
                                                            StartColumn = 21
                                                            EndLine = 1
                                                            EndColumn = 27 })],
    Some { StartLine = 1
           StartColumn = 0
           EndLine = 1
           EndColumn = 27 })]
Actual: [Paragraph
   ([Literal ("Before ", Some { StartLine = 1
                                StartColumn = 0
                                EndLine = 1
                                EndColumn = 7 });
     IndirectLink
       ([Literal ("indirectLink", Some { StartLine = 1
                                         StartColumn = 7
                                         EndLine = 1
                                         EndColumn = 19 })], "", "indirectLink",
        Some { StartLine = 1
               StartColumn = 7
               EndLine = 1
               EndColumn = 27 }); Literal (" After", Some { StartLine = 1
                                                            StartColumn = 7
                                                            EndLine = 1
                                                            EndColumn = 13 })],
    Some { StartLine = 1
           StartColumn = 0
           EndLine = 1
           EndColumn = 27 })]