doc(ottlfunc): add additional Now example

wbh1 · wbh1 · commit caaec6a8ea80 · 2023-09-21T12:13:18.000-04:00
diff --git a/pkg/ottl/ottlfuncs/README.md b/pkg/ottl/ottlfuncs/README.md
@@ -610,6 +610,7 @@ The returned type is `time.Time`.
 Examples:
 
 - `UnixSeconds(Now())`
+- `set(start_time, Now())`
 
 ### ParseJSON
 
