Update README.md (#13283)

* Update README.md

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Auto-format by https://ultralytics.com/actions

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

utils/segment/metrics.py

@@ -127,7 +127,7 @@ class Metric:
         return (self.mp, self.mr, self.map50, self.map)
 
     def class_result(self, i):
-        """Class-aware result, return p[i], r[i], ap50[i], ap[i]"""
+        """Class-aware result, return p[i], r[i], ap50[i], ap[i]."""
         return (self.p[i], self.r[i], self.ap50[i], self.ap[i])
 
     def get_maps(self, nc):
@@ -140,7 +140,7 @@ class Metric:
     def update(self, results):
         """
         Args:
-            results: tuple(p, r, ap, f1, ap_class)
+            results: tuple(p, r, ap, f1, ap_class).
         """
         p, r, all_ap, f1, ap_class_index = results
         self.p = p
@@ -163,7 +163,7 @@ class Metrics:
     def update(self, results):
         """
         Args:
-            results: Dict{'boxes': Dict{}, 'masks': Dict{}}
+            results: Dict{'boxes': Dict{}, 'masks': Dict{}}.
         """
         self.metric_box.update(list(results["boxes"].values()))
         self.metric_mask.update(list(results["masks"].values()))