fix: correct self-update reference to update command

- Fix release workflow template to say 'promptcode update' not 'promptcode self-update'
- The actual command is just 'update', not 'self-update'

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: avivsinai

.github/workflows/release.yml

@@ -167,7 +167,7 @@ jobs:
             4. Run: `promptcode --help`
 
             ### Features
-            - ✨ **Self-updating**: Run `promptcode self-update` to get the latest version
+            - ✨ **Auto-updating**: Run `promptcode update` to get the latest version
             - 🤖 **Claude Code Integration**: Auto-detects and configures for Claude projects
             - 🗑️ **Clean uninstall**: Run `promptcode uninstall` to remove completely