Update lexicon.mdx (#1832)

Author: djmixpanel

pages/docs/data-governance/lexicon.mdx

@@ -355,5 +355,5 @@ Mixpanel provides a variety of tools to make it easier for teams to better under
 | Tags | Allows your team to categorize events by different themes. |
 | Platforms | Allows your team to categorize which platforms this event is fired in. |
 | Owners | Allows your team to assign a point-of-contact to events in case team members have follow-up questions about an event. (Only available on the Enterprise Plan) |
-| First Tracked | The earliest event timestamp for this event in Mixpanel. First tracked dates are only recorded after 01/01/2021. |
+| First Tracked | The earliest date a given event was tracked, within the past two years. If the event was first tracked more than two years ago, that earlier date won't be reflected here. |
 | Image | Allows your team to upload a JPG, PNG, or GIF that helps to describe the event. This will show up throughout the platform wherever the event appears. |