#2398 sp_BlitzCache error truncation

Widen Finding column to 500 characters. Closes #2398.

Author: BrentOzar

sp_BlitzCache.sql

@@ -840,7 +840,7 @@ BEGIN
         CheckID INT,
         Priority TINYINT,
         FindingsGroup VARCHAR(50),
-        Finding VARCHAR(200),
+        Finding VARCHAR(500),
         URL VARCHAR(200),
         Details VARCHAR(4000)
     );