Fix link formatting in AI Policy reference

Signed-off-by: Nathan C. <149914029+Natuworkguy@users.noreply.github.com>

Author: Natuworkguy

CONTRIBUTING.md

@@ -116,7 +116,7 @@ All contributions should prioritize:
 - **Trivial Changes Only:** Very small edits are allowed.
 
 <!-- markdownlint-disable MD033 -->
-<small>This AI Policy is derived from [Gravel's AI Policy](https://github.com/Pacsfury/Gravel-Launcher/blob/main/AI-POLICY.md)](https://github.com/Pacsfury/Gravel-Launcher/blob/ed0301ba7aa82342ac937cf1d149d68d00008724/AI-POLICY.md).</small>
+<small>This AI Policy is derived from [Gravel's AI Policy](https://github.com/Pacsfury/Gravel-Launcher/blob/ed0301ba7aa82342ac937cf1d149d68d00008724/AI-POLICY.md).</small>
 <!-- markdownlint-enable MD033 -->
 
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