Apply suggestions from code review

Author: tannergooding

xml/System/String.xml

@@ -4365,7 +4365,7 @@ The following example demonstrates the <xref:System.String.CopyTo%2A> method.
 ## Remarks
 The initial content of the destination span passed to `action` is undefined. Therefore, it is the delegate's responsibility to ensure that every element of the span is assigned. Otherwise, the resulting string could contain random characters.
 
-In order to support interop scenarios, the underlying buffer is guaranteed to be at least 1 greater than represented by the span parameter of the action callback. This additional index represents the null-terminator and if written that is the only value supported, writing any value other than the null-terminator will result in corrupting the string and is considered undefined behavior.
+To support interop scenarios, the underlying buffer is guaranteed to be at least 1 greater than represented by the span parameter of the action callback. This additional index represents the null-terminator and, if written, that is the only value supported. Writing any value other than the null-terminator corrupts the string and is considered undefined behavior.
  ]]></format>
         </remarks>
       </Docs>