Update the ReadMe

Author: mdmintz

README.md

@@ -72,21 +72,21 @@ pytest my_first_test.py --browser=chrome
 self.open(URL)  # Navigate to the web page
 self.click(SELECTOR)  # Click a page element
 self.update_text(SELECTOR, TEXT)  # Type text (Add "\n" to text for pressing enter/return.)
-self.assert_element(SELECTOR)  # Assert element on the page
-self.assert_text(TEXT)  # Assert text on the page (has optional SELECTOR arg)
+self.assert_element(SELECTOR)  # Assert element is visible
+self.assert_text(TEXT)  # Assert text is visible (has optional SELECTOR arg)
 self.assert_title(PAGE_TITLE)  # Assert page title
 self.assert_no_404_errors()  # Assert no 404 errors from files on the page
-self.assert_no_js_errors()  # Assert no JavaScript errors on page (Chrome-ONLY)
+self.assert_no_js_errors()  # Assert no JavaScript errors on the page (Chrome-ONLY)
 self.execute_script(JAVASCRIPT)  # Execute javascript code
 self.go_back()  # Navigate to the previous URL
 self.get_text(SELECTOR)  # Get text from a selector
 self.get_attribute(SELECTOR, ATTRIBUTE)  # Get a specific attribute from a selector
 self.is_element_visible(SELECTOR)  # Find out if an element is visible on the page
-self.is_text_visible(TEXT)  # Find out if specific text is visible on the page (has optional SELECTOR arg)
+self.is_text_visible(TEXT)  # Find out if specific text is visible on the page (optional SELECTOR arg)
 self.hover_and_click(HOVER_SELECTOR, CLICK_SELECTOR)  # Mouseover an element and click another element
 self.select_option_by_text(DROPDOWN_SELECTOR, OPTION_TEXT)  # Select a dropdown option
 self.switch_to_frame(FRAME_NAME)  # Switch webdriver control to an iframe on the page
-self.switch_to_default_content()  # Switch webdriver control out of the current iframe to the page
+self.switch_to_default_content()  # Switch webdriver control out of the current iframe
 self.switch_to_window(WINDOW_NUMBER)  # Switch to a different window/tab
 self.save_screenshot(FILE_NAME)  # Save a screenshot of the current page
 ```
@@ -517,10 +517,10 @@ if self.is_element_visible('div#warning'):
 is_element_present(selector)  # is an element present on a page
 ```python
 if self.is_element_present('div#top_secret img.tracking_cookie'):
-    self.contact_cookie_monster()  # Not a real method unless you define it somewhere
+    self.contact_cookie_monster()  # Not a real SeleniumBase method
 else:
     current_url = self.get_current_url()
-    self.contact_the_nsa(url=current_url, message="Dark Zone Found")  # Not a real method unless you define it somewhere
+    self.contact_the_nsa(url=current_url, message="Dark Zone Found")  # Not a real SeleniumBase method
 ```
 Another example:
 ```python