update PyDolphinScheduler documentation link. (#11474)

diff --git a/dolphinscheduler-python/pydolphinscheduler/setup.py b/dolphinscheduler-python/pydolphinscheduler/setup.py
index d6228a7..2a12915 100644
--- a/dolphinscheduler-python/pydolphinscheduler/setup.py
+++ b/dolphinscheduler-python/pydolphinscheduler/setup.py
@@ -139,7 +139,7 @@
     ],
     project_urls={
         "Homepage": "https://dolphinscheduler.apache.org",
-        "Documentation": "https://dolphinscheduler.apache.org/python/index.html",
+        "Documentation": "https://dolphinscheduler.apache.org/python/dev/index.html",
         "Source": "https://github.com/apache/dolphinscheduler/tree/dev/dolphinscheduler-python/"
         "pydolphinscheduler",
         "Issue Tracker": "https://github.com/apache/dolphinscheduler/issues?"