Update the docs

Author: mdmintz

README.md

@@ -653,8 +653,9 @@ pytest test_coffee_cart.py --trace
 --sjw  # (Skip JS Waits for readyState to be "complete" or Angular to load.)
 --wfa  # (Wait for AngularJS to be done loading after specific web actions.)
 --pls=PLS  # (Set pageLoadStrategy on Chrome: "normal", "eager", or "none".)
---headless  # (Run tests in headless mode. The default arg on Linux OS.)
---headless2  # (Use the new headless mode, which supports extensions.)
+--headless  # (The default headless mode. Linux uses this mode by default.)
+--headless1  # (Use Chrome's old headless mode. Fast, but has limitations.)
+--headless2  # (Use Chrome's new headless mode, which supports extensions.)
 --headed  # (Run tests in headed/GUI mode on Linux OS, where not default.)
 --xvfb  # (Run tests using the Xvfb virtual display server on Linux OS.)
 --xvfb-metrics=STRING  # (Set Xvfb display size on Linux: "Width,Height".)

help_docs/customizing_test_runs.md

@@ -144,8 +144,9 @@ pytest my_first_test.py --settings-file=custom_settings.py
 --sjw  # (Skip JS Waits for readyState to be "complete" or Angular to load.)
 --wfa  # (Wait for AngularJS to be done loading after specific web actions.)
 --pls=PLS  # (Set pageLoadStrategy on Chrome: "normal", "eager", or "none".)
---headless  # (Run tests in headless mode. The default arg on Linux OS.)
---headless2  # (Use the new headless mode, which supports extensions.)
+--headless  # (The default headless mode. Linux uses this mode by default.)
+--headless1  # (Use Chrome's old headless mode. Fast, but has limitations.)
+--headless2  # (Use Chrome's new headless mode, which supports extensions.)
 --headed  # (Run tests in headed/GUI mode on Linux OS, where not default.)
 --xvfb  # (Run tests using the Xvfb virtual display server on Linux OS.)
 --xvfb-metrics=STRING  # (Set Xvfb display size on Linux: "Width,Height".)

help_docs/method_summary.md

@@ -550,6 +550,8 @@ self.inspect_html()
 
 self.is_valid_url(url)
 
+self.is_alert_present()
+
 self.is_online()
 
 self.is_chromium()