docs: added bypass note to advanced guidelines

Author: ParasSalonia

docs/maintainers/guidelines-advanced-issues.md

@@ -40,6 +40,8 @@ These issues often involve shaping how the SDK evolves over time.
 
 Contributors must have completed at least **3 Intermediate Issues** in this repository before being assigned an Advanced issue.
 
+*Note: Contributors who have already completed at least one Advanced issue bypass this prerequisite and can always take on more Advanced issues.*
+
 This requirement is enforced automatically by the `/assign` bot.
 
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