Added XML comments to TextInFileIsValid function.

WetPancake/ProductServices.fs

@@ -44,6 +44,17 @@ module  Pancake =
             | :? InvalidOperationException -> return text
         }
 
+    /// <summary>
+    /// Checks the text within the specified file to see if it contains a vaild end token.
+    /// They are '.', '!' and '?'.
+    /// </summary>
+    /// <param name="filePath">
+    /// The path of the .txt file being tested.
+    /// </param>
+    /// <remarks>
+    /// This function does not check to see if the filepath is valid.
+    /// Be sure to check the path is valid before calling this function.
+    /// </remarks>
     let TextInFileIsValidAsync filePath =
         async {
             return DataAccess.LoadFile filePath |> TextContainsValidEndToken