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Update the documentation for a parameter decorator
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‎pages/Decorators.md‎

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@@ -325,10 +325,11 @@ A *Parameter Decorator* is declared just before a parameter declaration.
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The parameter decorator is applied to the function for a class constructor or method declaration.
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A parameter decorator cannot be used in a declaration file, an overload, or in any other ambient context (such as in a `declare` class).
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The expression for the parameter decorator will be called as a function at runtime, with the following two arguments:
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The expression for the parameter decorator will be called as a function at runtime, with the following three arguments:
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1. The function containing the decorated parameter.
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2. The ordinal index of the parameter in the function's parameter list.
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1. Either the constructor function of the class for a static member, or the prototype of the class for an instance member.
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2. The name of the member.
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3. The ordinal index of the parameter in the function's parameter list.
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> NOTE  A parameter decorator can only be used to observe that a parameter has been declared on a method.
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