The new feature is now available for Beta user that install the latest Whatsapp Beta for iOS 2.22.13.6 update
Open any whatsapp chat and tap on the paperclip icon.
Click on the Document options to share any doc via whatsapp
To instant messaging app is rolling out another feature named 'unread chat filter' which is available for people who download the Beta version of the desktop app.
The Meta- own platform is working on the "Edit Text Messages " features which is currently under development