Use standard docs note style

Author: ddoktorski

docs/src/testing/gas-and-resource-estimation.md

@@ -48,7 +48,9 @@ Running 1 test(s) from tests/
 </details>
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-Note that gas report data calculation ignores state changes, the cost of declared classes, Starknet OS overhead, L1 handler payload length and calldata payload length.
+> 📝 **Note**
+>
+> Gas report data calculation ignores state changes, the cost of declared classes, Starknet OS overhead, L1 handler payload length and calldata payload length.
 
 ### Fuzzed Tests