chore: make headings less prominent

src/pages/stacks-blockchain/accounts.md

@@ -86,13 +86,13 @@ const stacksAddress = getAddressFromPrivateKey(
 
 A second alternative would be to use [stacks-gen](https://github.com/psq/stacks-gen).  This tool will generate all the keys you need in one place, including the values needed for calling the stacking contract, and also a WIF key for use with `bitcoind`.
 
-### stacks-gen prerequisite
+#### stacks-gen prerequisite
 Install `npx` if not already installed.
 ```
 npm install -g npx
 ```
 
-### stacks-gen usage
+#### stacks-gen usage
 ```
 npx -q stacks-gen sk --testnet