Fix broken multiline statement docstrings

[shadr]

This PR fixes a case with multiline docstrings that I missed in #102.
Previously formatter transformed

var a = 10

## This is function docstring
## It has multiple lines.
func a():
	pass

into

var a = 10

## This is function docstring


## It has multiple lines.
func a():
	pass

With this PR formatter no longer inserts new lines in the middle of a docstring.

[NathanLovato]

Thank you very much!