Fix install from adt advice (#4275)

It's a small fix; just stumbled upon it.

Signed-off-by: Daniel Ziegenberg <daniel@ziegenberg.at>

docs/installation.md

@@ -28,7 +28,7 @@ packages.
 
 [pip] is the only supported installation method.
 
-{{ install_from_adt("ansible-navigator") }}
+{{ install_from_adt("molecule") }}
 
 ```bash
 $ python3 -m pip install molecule ansible-core