What do "visa notification letter" and "official media letter" mean regarding a Chinese visa?

On the website for the Chinese Embassy in the US, the steps for getting an L visa listed here include the following note:
The Visa Notification Letter and the official media letter may be in the form of fax, photocopy or computer printout.
What is this referring to? I think that "Visa Notification Letter" is if you were invited to China by some official agency, but I'm not sure about "official media letter."
Best Answer
The information in the "Note:3" section under the L visa category is simply a typo. There is no "Visa Notification Letter" nor "official media letter" required for an L visa. Whomever was creating the content for that webpage copied and pasted rather than typing a bit about what form your itinerary could be provided in.
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