tracker issue : CF-4205065

Issue: IsCustomFunction() doc outdated per CF-3429588 fix

The IsCustomFunction() doc wasn't updated after CF-3429588 fixed IsCustomFunction() to again return true for function expressions. There are 3 issues:

1) The Usage section needs updated to clarify that function expressions are considered custom functions.

Current wording:

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 The IsCustomFunction function returns True for any function that can be called as a custom function, including functions defined using CFScript function declarations and cffunction tags, and functions that are ColdFusion component methods. For CFC methods, first instantiate the component.
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Suggested wording (note the inclusion of "CFScript function expressions"):

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 The IsCustomFunction function returns True for any function that can be called as a custom function, including functions defined using CFScript function declarations, CFScript function expressions, cffunction tags, and functions that are ColdFusion component methods. For CFC methods, first instantiate the component.
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2) The following needs removed:
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 Note: This function does not return true if the function was defined using a function expression, eg:

return 1;
 }
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3) The following needs removed (it's not even a relevant example b/c result holds a string value "Greater"):
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 // Non-customfunction

n1=1;
 n2=1;
 sum = n1 + n2;
 result = IIf(3 > "#sum#" , DE("Greater"), DE("Lesser"))
 writeoutput("Is it a customFunction: " & isCustomFunction(result) & "");

Is it customFunction: NO
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Related URL: [https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-functions/functions-in-k/iscustomfunction.html]

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