Clarify these whole cells are auto-generated

Author: hinerm

.github/templates/personalize_gemini_cell.py.j2

@@ -7,7 +7,7 @@
 #@markdown
 #@markdown 💡 Tip: Changing selections automatically updates the AI (after manually running once)
 
-# AUTO-GENERATED CONTENT BELOW - DO NOT EDIT MANUALLY
+# AUTO-GENERATED CELL - DO NOT EDIT MANUALLY
 # This section is automatically updated based on files in doc/llms/personas/
 
 # Experience level parameters (Colab forms)

.github/templates/set_coding_rules_cell.py.j2

@@ -7,7 +7,7 @@
 #@markdown
 #@markdown 💡 Tip: Changing selections automatically updates the AI (after manually running once)
 
-# AUTO-GENERATED CONTENT BELOW - DO NOT EDIT MANUALLY
+# AUTO-GENERATED CELL - DO NOT EDIT MANUALLY
 # This section is automatically updated based on files in doc/llms/rulesets/
 
 # Environment parameters (Colab forms)