Modify the URL comment to make it correct. (microsoft#482)

Co-authored-by: Alonso Guevara <[email protected]>

examples/single_verb/pipeline.yml

@@ -4,7 +4,7 @@ input:
   file_pattern: .*\.csv$
 workflows:
   - steps:
-      - verb: derive # https://github.com/microsoft/datashaper/blob/main/python/datashaper/datashaper/engine/verbs/derive.py
+      - verb: derive # https://github.com/microsoft/datashaper/blob/main/python/datashaper/datashaper/verbs/derive.py
         args:
           column1: "col1"
           column2: "col2"