Fix SEWorld Guidelines URL to correct link

Co-authored-by: CaptainEmerson <5417003+CaptainEmerson@users.noreply.github.com>

Author: Copilot

content/resources/comms-playbook.md

@@ -31,7 +31,7 @@ This playbook defines SIGSOFT's communication strategy across all channels.
 **Not appropriate:**
 - Commercial promotions, tool ads, surveys, research project announcements
 
-See the full [SEWorld Guidelines](https://www.sigsoft.org/resources/seworldguidelines.html) for formatting and submission details.
+See the full [SEWorld Guidelines](https://www2.sigsoft.org/seworld_guidelines/) for formatting and submission details.
 
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