docs: fixed dart install code section

Author: ErikaMolino

README.md

@@ -21,15 +21,10 @@ Visit our [online doc](https://clidocs-devmy-pillars-projects.vercel.app)!
 Install with dart tools:
 
 ```dart
-dart pub
-
-global activate
---
-
-source git
-https: //github.com/acadevmy/devmy_cli
+dart pub global activate --source git https://github.com/acadevmy/devmy_cli
 ```
 
+
 #### Install executable binaries
 
 1. Navigate to the [latest release](https://github.com/acadevmy/devmy_cli/releases/latest) on GitHub.