docs: Update CLI documentation (#709)

Co-authored-by: juno-bot <juno-bot@users.noreply.github.com>

Author: github-actions[bot]

docs/reference/cli/functions-eject.md

@@ -1,7 +1,7 @@
 Generate the required files to begin developing serverless functions in your project.
 
 ```
-Usage: juno functions eject [options]
+Usage: juno functions init [options]
 
 Options:
   -l, --lang            Specify the language for building the serverless functions: rust, typescript or javascript.

docs/reference/cli/functions.md

@@ -5,8 +5,7 @@ Usage: juno functions <subcommand> [options]
 
 Subcommands:
   build                Build your functions.
-  eject                Scaffold the necessary files for developing your serverless functions.
-  init                 Alias for eject.
+  init                 Scaffold the necessary files for developing your serverless functions.
   publish              Publish a new version of your functions.
   upgrade              Upgrade your satellite's serverless functions.