Add XML docs to ResultType enum members

Added summary XML documentation to each member of the ResultType enum in the ReC.Client namespace, clarifying the purpose of Full, OnlyHeader, and OnlyBody options.

src/ReC.Client/ReCClient.cs

@@ -493,8 +493,17 @@ namespace ReC.Client
     /// </summary>
     public enum ResultType
     {
+        /// <summary>
+        /// Returns both header and body.
+        /// </summary>
         Full,
+        /// <summary>
+        /// Returns only the header portion of the result.
+        /// </summary>
         OnlyHeader,
+        /// <summary>
+        /// Returns only the body portion of the result.
+        /// </summary>
         OnlyBody
     }
 }