Update udf.rst

Author: davidfrantz

docs/source/howto/udf.rst

@@ -11,7 +11,7 @@ This tutorial introduces User-Defined Functions in the FORCE Higher Level Proces
 
 .. admonition:: Info
 
-  *This tutorial uses FORCE v. 3.7.3*.
+  *This tutorial uses FORCE v. 3.7.4*.
 
   We assume that you already have an existing Level 2 ARD data pool, which contains preprocessed data for multiple years (see Level 2 ARD tutorial). 
   We also assume that you have a basic understanding of the higher-level processing system (see interpolation tutorial).