Hanging text in documentation

[Ian Mackenzie]

elm-markup/src/Mark.elm

Line 255 in fdd8e03

 Here's a brief example of a document that 

Should this be something like "Here's a brief example of a document that will parse a document with many of either raw strings orMyBlock blocks:", and then leave out the first sentence of the following paragraph? (Also, in the next paragraph, there's a small typo idenity...)

[Matthew Griffith]

Ha, thanks! Just made the fixes 😄