add align env

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

@@ -19,11 +19,13 @@ The following formula describes the overall fee, stem:[F], for a transaction:
 
 [stem]
 ++++
+\begin{align}
 F  = \text{gas_price}\cdot&\Bigg(\max_k v_k w_k + \\
 & + \; \text{da_calldata_cost}\left(2n+2(m-1) + \ell + 3t + \sum\limits_{i=1}^t q_i\right)\\ 
 & - \; \text{contract_update_discount}\cdot n - 240 \\
 & + \; \text{message_calldata_cost}\cdot\left(3t + \sum\limits_{i=1}^t q_i\right) \\
 & + \; \text{storage_write_cost}\cdot t\Bigg)
+\end{align}
 ++++
 
 where: