removed this[5] syntax

Author: Jolanrensen

docs/StardustDocs/topics/ColumnSelectors.md

@@ -49,7 +49,7 @@ or `ColumnSet` that adheres to the optional given condition. If no column adhere
 `NoSuchElementException` is thrown.
 
 ##### Col {collapsible="true"}
-`col(name)`, `col(5)`, `this[5]`
+`col(name)`, `col(5)`
 
 Creates a [ColumnAccessor](DataColumn.md) (or `SingleColumn`) for a column with the given 
 argument from the top-level or specified [column group](DataColumn.md#columngroup). The argument can be either an