adding 2 acceptable errors to url checker

Author: carriewright11

config_automation.yml

@@ -8,7 +8,7 @@ check-quizzes: false
 quiz_error_min: 0
 # Check that urls in the content are not broken
 url-checker: true
-url_error_min: 0
+url_error_min: 2
 # Spell check Rmds and quizzes
 spell-check: true
 spell_error_min: 0