Fix typo estimating-gas-and-tx-fees.mdx (#125)

fix typo - c*ontracts* ---->*contracts*

src/content/docs/en/developers/guides/estimating-gas-and-tx-fees.mdx

@@ -53,7 +53,7 @@ But it also exposes the `getL1Fee(bytes memory data)` function, which abstracts
 
 First of all, let’s quickly go over the key folders inside our project structure.
 
-It’s a standard Hardhat project, but most of our work is inside the c*ontracts* and _scripts_ folders.
+It’s a standard Hardhat project, but most of our work is inside the *contracts* and _scripts_ folders.
 
 <ClickToZoom src={txFeesProjectStructure} />