AWSSDKDocFunctionEmphasis.user.js

// ==UserScript==
// @name       AWS SDK Doc Function Emphasis
// @namespace  http://aycabta.github.io/
// @version    0.0.1
// @description  
// @include    /^http:\/\/docs\.aws\.amazon\.com/
// @grant      
// @copyright  2015+, Code Ass
// ==/UserScript==

(function() {
    var sheet;
    var style = document.createElement('style');
    style.setAttribute('id', 'great-css');
    style.type = "text/css";
    var head = document.getElementsByTagName('head')[0];
    head.appendChild(style);
    sheet = style.sheet;
    sheet.insertRule('h3.signature { background-color: #AAAAFF !important; }', sheet.cssRules.length);
})();