fix #11144

CONTRIBUTING.md

@@ -39,7 +39,7 @@ We only accept issues that are bug reports or feature requests. Bugs must be iso
 
 - Adhere to the [RECESS CSS property order](http://markdotto.com/2011/11/29/css-property-order/)
 - Multiple-line approach (one property and value per line)
-- Always a space after a property's colon (.e.g, `display: block;` and not `display:block;`)
+- Always a space after a property's colon (e.g., `display: block;` and not `display:block;`)
 - End all lines with a semi-colon
 - For multiple, comma-separated selectors, place each selector on its own line
 - Attribute selectors, like `input[type="text"]` should always wrap the attribute's value in double quotes, for consistency and safety (see this [blog post on unquoted attribute values](http://mathiasbynens.be/notes/unquoted-attribute-values) that can lead to XSS attacks).