Fixing documentation errors in Complex.Abs (#4717)

Author: msoeken

xml/System.Numerics/Complex.xml

@@ -246,11 +246,11 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The absolute value of a complex number is equivalent to its <xref:System.Numerics.Complex.Magnitude%2A> property. The absolute value of a real number a + bi is calculated as follows:  
+ The absolute value of a complex number is equivalent to its <xref:System.Numerics.Complex.Magnitude%2A> property. The absolute value of a complex number a + bi is calculated as follows:  
   
--   If b = 0, the result is 0.  
+-   If b = 0, the result is a.  
   
--   If a > b, the result is a *<xref:System.Math.Sqrt%2A?displayProperty=nameWithType>(1 + b<sup>2</sup>/a<sup>2</sup>).  
+-   If a > b, the result is a * <xref:System.Math.Sqrt%2A?displayProperty=nameWithType>(1 + b<sup>2</sup>/a<sup>2</sup>).  
   
 -   If b > a, the result is b * <xref:System.Math.Sqrt%2A?displayProperty=nameWithType>(1 + a<sup>2</sup>/b<sup>2</sup>).