Fix for docstrings for Command.command setter and getter (Azure#36520)

Setter and getter docstrings were reversed.

Author: dunnkers

sdk/ml/azure-ai-ml/azure/ai/ml/entities/_builders/command.py

@@ -394,7 +394,7 @@ def component(self) -> Union[str, CommandComponent]:
 
     @property
     def command(self) -> Optional[str]:
-        """Sets the command to be executed.
+        """The command to be executed.
 
         :rtype: Optional[str]
         """
@@ -408,7 +408,7 @@ def command(self) -> Optional[str]:
 
     @command.setter
     def command(self, value: str) -> None:
-        """The command to be executed.
+        """Sets the command to be executed.
 
         :param value: The command to be executed.
         :type value: str