Merge pull request #786 from ethersphere/fix/spelling-updatable

fix: correct spelling of "updatable" in introduction.md

Author: EchinopsisMonstrose

docs/develop/introduction.md

@@ -94,7 +94,7 @@ This is the go-to starting point for web3 developers who want to build with Swar
         <a class="hub-card__link" href="/docs/develop/dynamic-content">
           <h3 class="hub-card__title">Dynamic Content</h3>
           <p class="hub-card__desc">
-            Learn how to use feeds to create updateable content on Swarm — with a complete example project that builds a dynamic note board.
+            Learn how to use feeds to create updatable content on Swarm — with a complete example project that builds a dynamic note board.
           </p>
           <span class="hub-card__cta">Open guide</span>
         </a>