fix(DOCUMENTATION): fix incorrect example description

The example description for the `VRTK_ContentHandler` had been copied
and pasted from a previous script and was incorrect. The text has been
updated so it's more appropriate.

Author: thestonefox

DOCUMENTATION.md

@@ -1763,7 +1763,7 @@ The script will use the boundaries of the control to determine if it is in or ou
 
 ### Example
 
-`SteamVR_Unity_Toolkit/Examples/025_Controls_Overview` has a selection of sliders at various angles with different step values to demonstrate their usage.
+`SteamVR_Unity_Toolkit/Examples/025_Controls_Overview` has a drawer with a collection of items that adhere to this concept.
 
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