fix: Minor edit in fee-mechanism.adoc (#1206)

* Minor edit in fee-mechanism.adoc

* Fix list indentation

components/Starknet/modules/architecture_and_concepts/pages/Network_Architecture/fee-mechanism.adoc

@@ -38,11 +38,16 @@ For more information see xref:#calculation_of_computation_costs[Calculation of c
 * stem:[$t$] is the number of L2->L1 messages sent, where the corresponding payload sizes are denoted by stem:[$q_1,...,q_t$].
 * stem:[$\ell$] is the number of contracts whose class was changed, which happens on contract deployment and when applying the `replace_class` syscall.
 * stem:[$D$] is 1 if the transaction is of type `DECLARE` and 0 otherwise. Declare transactions need to post on L1 the new class hash and compiled class hash which are added to the state.
-* L2->L1 messages related constants (for more details, see xref:#l_2-l_1_messages[]):
+* L2->L1 messaging constants:
++
+--
 ** stem:[$\text{message_calldata_cost}$] is 1124 gas per 32-byte word. 
 ** stem:[$\text{l1_log_data_cost}$] is 256 gas.
 ** stem:[$\text{l1_storage_write_cost}$] is the cost of writing to a new storage slot on Ethereum, which is 20,000 gas.
 ** stem:[$\text{log_message_to_l1_cost}$] is 1637 gas.
+--
++
+For more information, see xref:#l_2-l_1_messages[].
 * stem:[$\text{l2_payload_costs}$] is the gas cost of data sent over L2. This includes calldata, code, and event emission. For more details see xref:#l2_calldata[].
 * stem:[$\text{felt_size_in_bytes}$] is 32, which is the number of bytes required to encode a single STARK field element.