Update index.md

Author: arjunsuresh

docs/index.md

@@ -12,7 +12,7 @@ See the [automatically generated catalog](scripts/index.md) of all the MLC scrip
 ### MLC script execution flow
 ```mermaid
 graph TD
-    A[env = incoming env + env_from_meta] -->B[Script]
+    MLC -->|env = incoming env + env_from_meta| B[Script]
     B -->|env - local_env_keys| C[List of Dependencies]
     C --> D[Preprocess]
     D -->|env - local_env_keys| E[Prehook dependencies]