Fix typo in docs (2-way formater)

Could also simplify the example replacing Math.pow(10.2) with 100
Merge branch 'patch-1' of https://github.com/aristidesfl/rivets into fix-typo-in-formatter-docs

Conflicts:
	sections/formatters/two-way.html
Fix docs for two-way formatter example.[#320]
Merge branch 'fix-typo-in-formatter-docs' into gh-pages