minit: fix docstring

Which must come before `from __future__`

mesonbuild/minit.py

@@ -11,10 +11,11 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from __future__ import annotations
 
 """Code that creates simple startup projects."""
 
+from __future__ import annotations
+
 from pathlib import Path
 from enum import Enum
 import subprocess