[FloatingActionButtonLocation] Fix documentation (#71378)

packages/flutter/lib/src/material/floating_action_button_location.dart

@@ -63,57 +63,75 @@ const double kMiniButtonOffsetAdjustment = 4.0;
 /// The following diagrams show the available placement locations for the FloatingActionButton.
 ///
 /// * [FloatingActionButtonLocation.centerDocked]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_center_docked.png)
 ///
 /// * [FloatingActionButtonLocation.centerFloat]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_center_float.png)
 ///
 /// * [FloatingActionButtonLocation.centerTop]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_center_top.png)
 ///
 /// * [FloatingActionButtonLocation.endDocked]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_end_docked.png)
 ///
 /// * [FloatingActionButtonLocation.endFloat]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_end_float.png)
 ///
 /// * [FloatingActionButtonLocation.endTop]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_end_top.png)
 ///
 /// * [FloatingActionButtonLocation.startDocked]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_start_docked.png)
 ///
 /// * [FloatingActionButtonLocation.startFloat]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_start_float.png)
 ///
 /// * [FloatingActionButtonLocation.startTop]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_start_top.png)
 ///
 /// * [FloatingActionButtonLocation.miniCenterDocked]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_center_docked.png)
 ///
 /// * [FloatingActionButtonLocation.miniCenterFloat]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_center_float.png)
 ///
 /// * [FloatingActionButtonLocation.miniCenterTop]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_center_top.png)
 ///
 /// * [FloatingActionButtonLocation.miniEndDocked]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_end_docked.png)
 ///
 /// * [FloatingActionButtonLocation.miniEndFloat]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_end_float.png)
 ///
 /// * [FloatingActionButtonLocation.miniEndTop]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_end_top.png)
 ///
 /// * [FloatingActionButtonLocation.miniStartDocked]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_start_docked.png)
 ///
 /// * [FloatingActionButtonLocation.miniStartFloat]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_start_float.png)
 ///
 /// * [FloatingActionButtonLocation.miniStartTop]:
+///
 ///   ![](https://flutter.github.io/assets-for-api-docs/assets/material/floating_action_button_location_mini_start_top.png)
 ///
 /// See also: