revised appium commands
doc improvements
- minor wording changes
- defined style of code examples, please use the following structure:

/**
 *
 * some description
 *
 * <example>
    :filename.js
    // some example code
    client.setCookie({
        name: 'myCookie',
        value: 'some content'
    });

    :filename2.html
    <div>some example code</div>
 * </example>
 *
 * @param {Object} var some var description
 * @uses protocol/command
 * @type action (the following are defined: appium, protocol, action, mobile, cookie, state, utility, window,property)
 *
 */

....
// some code