Update BigInteger.xml (#4041)

Fix copy/paste error.

Author: slozier

xml/System.Numerics/BigInteger.xml

@@ -3554,7 +3554,7 @@ value Mod 2 = 0
 ## Remarks  
  The overloads of the <xref:System.Numerics.BigInteger.op_Explicit(System.Decimal)~System.Numerics.BigInteger> method define the types to which or from which a <xref:System.Numerics.BigInteger> object can be converted. Language compilers do not perform this conversion automatically because it can involve data loss. Instead, they perform the conversion only if a casting operator (in C#) or a conversion function (such as `CType` or `CInt` in Visual Basic) is used. Otherwise, they display a compiler error.   
 
- Because this operation defines a narrowing conversion, it can throw an <xref:System.OverflowException> at run time if the <xref:System.Numerics.BigInteger> value is outside the range of the <xref:System.Int32> data type. There is no loss of precision in the resulting <xref:System.Int16> value if the conversion is successful.
+ Because this operation defines a narrowing conversion, it can throw an <xref:System.OverflowException> at run time if the <xref:System.Numerics.BigInteger> value is outside the range of the <xref:System.Int32> data type. There is no loss of precision in the resulting <xref:System.Int32> value if the conversion is successful.
 
 ## Examples
  The following example illustrates the conversion of <xref:System.Numerics.BigInteger> to <xref:System.Int32> values. It also handles an <xref:System.OverflowException> that is thrown because the <xref:System.Numerics.BigInteger> value is outside the range of the <xref:System.Int32> data type.