Update UnitTests' EditorConfig

Add comments describing the nature of the warning.

Author: Nirmal4G

UnitTests/UnitTests.Shared/.editorconfig

@@ -1,7 +1,17 @@
-[*.{cs,vb}]
 
-# SA1601: Partial elements should be documented
+# Analyzer Configurations for Unit Test sources
+
+# C# Source Files
+[*.cs]
+
+# A C# partial element is missing a documentation header.
 dotnet_diagnostic.SA1601.severity = none
+
+# The Parameter has no matching param tag in the XML comment.
 dotnet_diagnostic.CS1573.severity = none
+
+# Missing XML comment for publicly visible type or member.
 dotnet_diagnostic.CS1591.severity = none
-dotnet_diagnostic.CS1712.severity = none
+
+# The Type parameter has no matching typeparam tag in the XML comment.
+dotnet_diagnostic.CS1712.severity = none