Document cases where parens are accepted even in omit_parentheses s…

…tyle

lib/rubocop/cop/style/method_call_with_args_parentheses.rb

@@ -79,6 +79,30 @@ module Style
       #   # good
       #   foo.enforce strict: true
       #
+      #   # good
+      #   # Allows parens for calls that won't produce valid Ruby or be ambiguous.
+      #   model.validate strict(true)
+      #
+      #   # good
+      #   # Allows parens for calls that won't produce valid Ruby or be ambiguous.
+      #   yield path, File.basename(path)
+      #
+      #   # good
+      #   # Operators methods calls with parens
+      #   array&.[](index)
+      #
+      #   # good
+      #   # Operators methods without parens, if you prefer
+      #   array.[] index
+      #
+      #   # good
+      #   # Operators methods calls with parens
+      #   array&.[](index)
+      #
+      #   # good
+      #   # Operators methods without parens, if you prefer
+      #   array.[] index
+      #
       # @example IgnoreMacros: true (default)
       #
       #   # good