Update pages/toolkits/productivity/google_docs.mdx

Co-authored-by: Evan Tahler <evan@arcade.dev>

Author: EricGustin

pages/toolkits/productivity/google_docs.mdx

@@ -119,7 +119,9 @@ Get the latest version of the specified Google Docs document in DocMD format. Th
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-Edit a Google Docs document using natural language edit requests. This tool is stateless and does not have context about previous edits. If your edit request depends on knowledge about previous edits, provide that context in the edit requests.
+Edit a Google Docs document using natural language edit requests. This tool is stateless and does not have context about previous edits. If your edit request depends on knowledge about previous edits, provide that context in the edit requests.  
+
+Note that this tool is agentic, and requires the secret OPENAI_API_KEY to be set.
 
 **Parameters**