Add 3.16.2 changelog

contrib/changelog/prod/3.16.2_1682328633.md

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+* Logging in with a username and password is no longer available in the terminal as we've switched to more secure login options.
+* Thanks to the community of our eagle-eyed contributors, we've removed a bunch of typos.
+
+Improvements in file sharing over Meshnet:
+* Notifications will inform you about the file transfer status.
+* Transfers containing no files will be rejected automatically.
+* Error messages have been updated for more clarity and precision.
+* Fixed: We'll show the correct status for transfers canceled by the sender.