add escape dollar signs

Author: roethke

docs/base-chain/network-information/network-fees.mdx

@@ -30,7 +30,7 @@ documentation](https://docs.optimism.io/stack/transactions/fees).
 
 As part of the [Jovian upgrade], Base introduced a minimum base fee. This feature sets a floor for the L2 base fee, preventing it from dropping to extremely low levels during periods of low network activity.
 
-The minimum base fee for Base Mainnet is 2,000,000 wei (0.002 gwei). This value may be periodically adjusted as we gather data on how it affects the chain. For reference, a minimum base fee of 0.002 gwei results in a cost of approximately $0.001 for a typical 200,000 gas transaction at an ETH price of $2500.
+The minimum base fee for Base Mainnet is 2,000,000 wei (0.002 gwei). This value may be periodically adjusted as we gather data on how it affects the chain. For reference, a minimum base fee of 0.002 gwei results in a cost of approximately \$0.001 for a typical 200,000 gas transaction at an ETH price of \$2500.
 
 ### Benefits