docs(browser.wait): add default browser.wait time

lib/selenium-webdriver/webdriver.js

@@ -277,7 +277,7 @@ webdriver.WebDriver.prototype.call = function(fn, opt_scope, var_args) {};
  *           function(!webdriver.WebDriver): T)} condition The condition to
  *     wait on, defined as a promise, condition object, or  a function to
  *     evaluate as a condition.
- * @param {number=} opt_timeout How long to wait for the condition to be true.
+ * @param {number=} opt_timeout How long to wait for the condition to be true. Will default 30 seconds, or to the jasmineNodeOpts.defaultTimeoutInterval in your protractor.conf.js file.
  * @param {string=} opt_message An optional message to use if the wait times
  *     out.
  * @returns {!webdriver.promise.Promise<T>} A promise that will be fulfilled