Update Authoring_quick_start_1.md

Update the docs in the quick start to avoid the default editor problem from the get-go.

doc/en/AbInitio/Authoring_quick_start_1.md

@@ -11,6 +11,7 @@ We assume the following:
 
 1. You have access to a course with STACK installed.
 2. You are familiar with simple \(\LaTeX\) formatting for mathematics.  Some basic examples are provided in the [CASText](../Authoring/CASText.md) documentation.
+3. __We strongly recommend you do not use an HTML-aware editor when editing STACK questions containing GeoGebra.__  Instead turn off the editor within Moodle and edit the raw HTML.  Individual users can set their editor preferences by following: `User Dashboard > Preferences > Editor preferences > Manage editors`
 
 ## Creating a minimal STACK question