docs: remove extraneous closing backtick in implementation plan

Minor formatting fix to GET_SAVED_FILTER_BY_ID_IMPLEMENTATION.md
to remove an extra closing backtick in the API documentation section.

No functional changes - documentation formatting only.

GET_SAVED_FILTER_BY_ID_IMPLEMENTATION.md

@@ -463,7 +463,6 @@ curl -H "Authorization: Bearer YOUR_TOKEN" \\
 - Verification: Check filter exists before operations
 
 ---
-```
 
 **Notes:**
 - ✅ Follows existing documentation pattern