minor #14758 Use max_colons rule for DOCtor-RST (OskarStark)

This PR was merged into the 4.4 branch.

Discussion
----------

Use max_colons rule for DOCtor-RST

Follows #14757 and OskarStark/doctor-rst#882

Commits
-------

88130c1 Use max_colons rule for DOCtor-RST

Author: OskarStark

.doctor-rst.yaml

@@ -14,6 +14,7 @@ rules:
     lowercase_as_in_use_statements: ~
     max_blank_lines:
         max: 2
+    max_colons: ~
     no_app_console: ~
     no_blank_line_after_filepath_in_php_code_block: ~
     no_blank_line_after_filepath_in_twig_code_block: ~