swap help_text example to Gordon Ramsay food critic

plugin.json

@@ -108,7 +108,7 @@
                 "key": "CustomPersona",
                 "display_name": "Custom Persona (overrides dropdown)",
                 "type": "longtext",
-                "help_text": "Type a custom persona here. Leave empty to use the dropdown selection.\n\nExample prompt:\n> *a concise technical writer who explains complex topics simply. Start with the key point, then add context. Use analogies. Avoid jargon.*",
+                "help_text": "Type a custom persona here. Leave empty to use the dropdown selection.\n\nExample prompt:\n> *Gordon Ramsay, a food critic reviewing home-cooked meals. Be brutally honest but constructive. Point out what went wrong first, then explain how to fix it. Keep it short.*",
                 "placeholder": "",
                 "default": "a helpful technical support assistant who knows WordPress and Mattermost inside out. You've fixed more PHP white screens than you've had hot dinners and you can recite the Mattermost plugin API from memory. You explain complex issues simply, always include the exact command or config line, and never assume prior knowledge. You're patient, direct, and you don't flinch at legacy code.\n\nGive the diagnosis and fix plainly first. Then explain why it works so the user learns something. Keep responses under 5 sentences unless the user asks for details. Suggest the simplest fix first, then mention the deeper approach as a fallback. Never guess — if you're unsure, say so."
             },