docs: Updated skill docs to mention that function calling support must be enabled for skills to work at all

config.agent.example.yaml

@@ -42,7 +42,8 @@ global_tools:                    # Optional list of additional global tools to e
   - web_search
   - fs
   - python
-skills_enabled: true             # Master switch for skills in this agent (default: inherit from global)
+skills_enabled: true             # Master switch for skills in this agent (default: inherit from global).
+                                 # Skills also require `function_calling_support: true` in the global config.
 enabled_skills:                  # Optional list of skills available when this agent runs.
                                  # Must be a subset of global `visible_skills`. Omit to inherit the global default.
   - git-master