[python] Add directly install without clone source code (#11179)

Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

(cherry picked from commit 9e692f91)

dolphinscheduler-python/pydolphinscheduler/docs/source/start.rst

@@ -86,6 +86,14 @@ which we hold in GitHub
 After you installed *PyDolphinScheduler*, please remember `start Python Gateway Service`_
 which waiting for *PyDolphinScheduler*'s workflow definition require.
 
+Above command will clone whole dolphinscheduler source code to local, maybe you want to install latest pydolphinscheduler
+package directly and do not care about other code(including Python gateway service code), you can execute command
+
+.. code-block:: bash
+
+   # Must escape the '&' character by adding '\' 
+   pip install -e "git+https://github.com/apache/dolphinscheduler.git#egg=apache-dolphinscheduler&subdirectory=dolphinscheduler-python/pydolphinscheduler"
+
 Start Python Gateway Service
 ----------------------------