Fix formatting in grumpy-reviewer.md diagram (#195)

Author: GabeL7r

docs/grumpy-reviewer.md

@@ -22,7 +22,7 @@ This walks you through adding the workflow to your repository.
 
 ```mermaid
 graph LR
-    A[/grumpy command] --> B[Read PR diff]
+    A[grumpy command] --> B[Read PR diff]
     B --> C[Check cache memory]
     C --> D[Analyze changed files]
     D --> E{Issues found?}