Update docs/app-developer-guide/index.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: akremenetsky

docs/app-developer-guide/index.md

@@ -56,7 +56,7 @@ Install and run your element on a Genesis Core platform installation.
 genesis elements install <element-name>
 ```
 
-The platform resolves dependencies, installes the target element, and starts it in the chosen realm.
+The platform resolves dependencies, installs the target element, and starts it in the chosen realm.
 
 [Learn more →](deploy.md)