Document warning suppressions via rule set files

Fixes #1629

Author: sharwell

documentation/SA1652.md

@@ -34,8 +34,20 @@ errors over time.
 To fix a violation of this rule, enable the XML documentation file as part of the project output.
 
 **Note:** In some cases, enabling XML documentation output will produce a large number of warnings CS1573 and/or CS1591
-to be reported. To improve the ability of teams to resolve SA1652 before CS1573 and/or CS1591, consider editing the
-project file to include the following property group.
+to be reported. To improve the ability of teams to resolve SA1652 before CS1573 and/or CS1591, consider disabling these
+warnings by one of the following methods.
+
+### Suppression via rule set files
+
+CS1573 and CS1591 are most easily suppressed by editing the rule set file. The severity of these rules may be set to
+**Hidden** or **None** to hide them from the build output.
+
+### Suppression via the project file
+
+For users who sometimes build their project with older versions of C# (which do not support rule set files), these
+warnings may be suppressed by configuring the `<NoWarn>` element in the project file. One easy way to configure both the
+documentation output (which corrects SA1652) and the suppressions for CS1573 and CS1591 is to add the following property
+group to the project file.
 
 ```xml
 <PropertyGroup>