Update website/pages/en/quick-start.mdx

Co-authored-by: Benoît Rouleau <[email protected]>

Author: idalithb

website/pages/en/quick-start.mdx

@@ -9,7 +9,7 @@ Learn how to easily publish and query a [subgraph](/developing/developer-faqs/#1
 - A crypto wallet
 - A smart contract address on one of the [supported networks](/developing/supported-networks/)
 
-## Step-by-Step
+## Step-by-step
 
 ### 1. Install the Graph CLI