docs/Demo_mode.md updated from https://stackedit.io/

Author: fghalasz

docs/Demo_mode.md

@@ -71,26 +71,7 @@ Additionally, if a ```start=<encoded start-script URL>``` query parameter is inc
 
 For legacy reasons,  ```https:://online.interlisp.org/demo/guest``` and ```https:://online.interlisp.org/guest``` are synonyms for ```https::online.interlisp.org/demo```.
 
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