hwmon: Drop dead links to old National Semiconductor chip datasheets

Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427
index 9a0708f..d1ebbe5 100644
--- a/Documentation/hwmon/pc87427
+++ b/Documentation/hwmon/pc87427
@@ -5,7 +5,7 @@
   * National Semiconductor PC87427
     Prefix: 'pc87427'
     Addresses scanned: none, address read from Super I/O config space
-    Datasheet: http://www.winbond.com.tw/E-WINBONDHTM/partner/apc_007.html
+    Datasheet: No longer available
 
 Author: Jean Delvare <khali@linux-fr.org>