Show Function Syntax While Typing Expressions

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When typing a function (often the formula tool), you can use autocomplete to get the syntax to display, however if you are editing a previously written expression, you have remember or try to guess at the syntax.  This often leads to having to consult the documentation or adding an extra duplicate function below your code just to see the syntax (that you then have to remember to remove).  This process could be improved by showing a window that shows the function syntax while you are typing within the parentheses of the function.  This would be even more useful with nested functions to see which function you are within.