Fix start_min/end_min key names in alert_policy docs. (#199)

Similar to what 3d2ff63 does for notification_policy.

Co-authored-by: Rudolf Thomas <[email protected]>

website/docs/r/alert_policy.html.markdown

@@ -132,19 +132,19 @@ The `restrictions` block supports:
 
 * `end_hour` - (Required) Ending hour of restriction on defined `end_day`
 
-* `start_minute` - (Required) Staring minute of restriction on defined `start_hour`
+* `start_min` - (Required) Staring minute of restriction on defined `start_hour`
 
-* `end_minute` - (Required) Ending minute of restriction on defined `end_hour`
+* `end_min` - (Required) Ending minute of restriction on defined `end_hour`
 
 The `restriction` block supports:
 
 * `start_hour` - (Required) Starting hour of restriction.
 
 * `end_hour` - (Required) Ending hour of restriction.
 
-* `start_minute` - (Required) Staring minute of restriction on defined `start_hour`
+* `start_min` - (Required) Staring minute of restriction on defined `start_hour`
 
-* `end_minute` - (Required) Ending minute of restriction on defined `end_hour`
+* `end_min` - (Required) Ending minute of restriction on defined `end_hour`
 
 The `responders` block supports: