Updated documentation.

Author: kmvanbrunt

CHANGELOG.md

@@ -57,6 +57,9 @@ prompt is displayed.
     - Changed `StatementParser.parse_command_only()` to return a `PartialStatement` object.
     - Renamed `Macro.arg_list` to `Macro.args`.
     - Removed `terminal_utils.py` since `prompt-toolkit` provides this functionality.
+    - Replaced `async_alert()` and `async_update_prompt()` with a single function called
+      `add_alert()`. This new function is thread-safe and does not require you to acquire a mutex
+      before calling it like the previous functions did.
 - Enhancements
     - New `cmd2.Cmd` parameters
         - **auto_suggest**: (boolean) if `True`, provide fish shell style auto-suggestions. These

docs/features/prompt.md

@@ -28,14 +28,11 @@ for an example of dynamically updating the prompt.
 
 ## Asynchronous Feedback
 
-`cmd2` provides these functions to provide asynchronous feedback to the user without interfering
-with the command line. This means the feedback is provided to the user when they are still entering
-text at the prompt. To use this functionality, the application must be running in a terminal that
-supports [VT100](https://en.wikipedia.org/wiki/VT100) control characters. Linux, Mac, and Windows 10
-and greater all support these.
-
-- [cmd2.Cmd.async_alert][]
-- [cmd2.Cmd.async_update_prompt][]
+`cmd2` provides a function to deliver asynchronous feedback to the user without interfering with the
+command line. This means the feedback is provided to the user when they are still entering text at
+the prompt.
+
+- [cmd2.Cmd.add_alert][]
 
 `cmd2` also provides a function to change the title of the terminal window. This feature requires
 the application be running in a terminal that supports VT100 control characters. Linux, Mac, and