fix link to project access key docs (#36)

Author: axl1313

src/cleanlab_codex/project.py

@@ -70,7 +70,7 @@ def id(self) -> str:
 
     @classmethod
     def from_access_key(cls, access_key: str) -> Project:
-        """Initialize a Project from a [project-level access key](/codex/sme_tutorials/getting_started/#setting-up-access-keys).
+        """Initialize a Project from a [project-level access key](/codex/sme_tutorials/getting_started/#access-keys).
 
         Args:
             access_key (str): The access key for authenticating project access.