Fix confusing comment re: function casing.
Fix whitespace not conforming to code style in some examples.
Fixed: the URL link to the style guide

Was: https://github.com/mobify/mobify-code-style/blob/master/css-handbook/Readme.md
Now: https://github.com/mobify/mobify-code-style/blob/master/css/Readme.md

@jamesbull
Change docs to favour 0.5 over .5 for decimal form.