Update fee-mechanism.adoc

Author: LandauRaz

components/Starknet/modules/architecture-and-concepts/pages/network-architecture/fee-mechanism.adoc

@@ -1,14 +1,14 @@
 [id="gas-and-transaction-fees"]
-= Fee mechanism
+= Fees
 
 [IMPORTANT]
 ====
-This section describes fees that are paid on L2 starting in Starknet 0.13.0.
+This section describes fees that are paid on L2 (starting in Starknet 0.13.0).
 
 For information about messaging fees that are paid on L1, see xref:network-architecture/messaging-mechanism.adoc#l1-l2-message-fees[L1→L2 message fees].
 ====
 
-== Introduction
+== Overview
 
 Every transaction on Starknet requires a small fee to process. The components contributing to this fee include xref:#fee_components [L2 computation, L2 data, and L1 data], which are measured in xref:#fee_units_and_limits[L2 gas, L1 gas, and L1 data gas]. A transaction's fee is xref:#charging_fees[charged atomically when it is executed] and can be xref:#estimating_fees[estimated using the `starknet_estimateFee` call], based on the xref:#overall_fee[formula for determining a transaction's fee].