Update arbitrum-docs/stylus/concepts/how-it-works.md

Co-authored-by: Pete <[email protected]>

arbitrum-docs/stylus/concepts/how-it-works.md

@@ -49,7 +49,7 @@ For more details on Nitro’s architecture, refer to the [documentation](/how-ar
 
 Stylus innovates on many levels, with the key ones described here:
 
-#### One chain, many languages
+### One chain, many languages
 
 There are estimated to be roughly 20k Solidity developers, compared to 3 million Rust developers or 12 million C developers [[1](https://slashdatahq.medium.com/state-of-the-developer-nation-23rd-edition-the-fall-of-web-frameworks-coding-languages-711525e3df3a)]. Developers are now free to use their preferred programming language, all interoperable on any <a data-quicklook-from="arbitrum-chain">Arbitrum chain</a> with Stylus. By onboarding the next million developers, scaling to the next billion users becomes possible.