fix type docstring T229975788

Summary: D2 lint will complain the use of modern type annotation  **edge_color: tuple[float, float, float] | None**. So remove it.

Differential Revision: D77828126

fbshipit-source-id: 823b4b6bdc419f58e2413484b341d5da5a1b9fd7

Author: stephenyan1231

detectron2/utils/visualizer.py

@@ -450,8 +450,8 @@ def draw_sem_seg(
         sem_seg,
         area_threshold=None,
         alpha=0.8,
-        draw_text: bool = True,
-        edge_color: tuple[float, float, float] | None = _OFF_WHITE,
+        draw_text=True,
+        edge_color=_OFF_WHITE,
     ):
         """
         Draw semantic segmentation predictions/labels.