updated google calendar docs with more fields

Author: ramsrib

fern/tools/google-calendar.mdx

@@ -89,15 +89,18 @@ This tool uses the following fields to create events:
 - `summary`: The title or description of the calendar event
 - `startDateTime`: The start date and time of the event
 - `endDateTime`: The end date and time of the event
-- `timeZone`: The timezone for the event
+- `attendees`: A list of email addresses for people to invite to the event
+- `timeZone`: The timezone for the event, defaults to UTC
+- `calendarId`: The calendar ID to create the event in, defaults to the primary calendar
 
 ### Google Calendar Check Availability Tool
 
 This tool uses the following fields to check availability:
 
 - `startDateTime`: The start of the time range to check
 - `endDateTime`: The end of the time range to check
-- `timeZone`: The timezone for the availability check
+- `timeZone`: The timezone for the availability check, defaults to UTC
+- `calendarId`: The calendar ID to check availability in, defaults to the primary calendar
 
 <Info>
   All datetime fields should be provided in ISO 8601 format.