Fix abbreviation rendering with table at the end

[lukasrad02]

Closes #458

Trailing newlines are stripped from the markdown, thus needing two \n before appending the abbreviations.

[coveralls]

Pull Request Test Coverage Report for Build 7513625219

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 74.357%

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Totals
Change from base Build 7513583978:	0.0%
Covered Lines:	1273
Relevant Lines:	1712

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💛 - Coveralls