Fix imports for before_kickoff and after_kickoff in documentation

Co-Authored-By: Joe Moura <joao@crewai.com>

docs/how-to/before-and-after-kickoff-hooks.mdx

@@ -12,7 +12,8 @@ The before kickoff hook is executed before the crew starts its tasks. It receive
 Here's an example of defining a before kickoff function in your `crew.py`:
 
 ```python
-from crewai import CrewBase, before_kickoff
+from crewai import CrewBase
+from crewai.project import before_kickoff
 
 @CrewBase
 class MyCrew:
@@ -34,7 +35,8 @@ The after kickoff hook is executed after the crew has completed its tasks. It re
 Here's how you can define an after kickoff function in your `crew.py`:
 
 ```python
-from crewai import CrewBase, after_kickoff
+from crewai import CrewBase
+from crewai.project import after_kickoff
 
 @CrewBase
 class MyCrew: