[Password Manager] Update faq on Linux storing of passwords

Bug: 893553
Change-Id: Ia935b7b07ad16d6b801a809d06d0a518576dc871
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700222Reviewed-by: Chris Palmer <palmer@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Auto-Submit: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682173}

docs/security/faq.md

@@ -621,10 +621,12 @@ specific:
      credentials in "Login Data" in the Chrome users profile directory, but
      encrypted on disk with a key that is then stored in the user's Keychain.
      See [Issue 466638](https://crbug.com/466638) for further explanation.
-*    On Linux, credentials are stored into Gnome-Keyring or KWallet, depending
-     on the environment. On environments which don't ship with Gnome-Keyring
-     or KWallet, the password is stored into "Login Data" in an unprotected
-     format.
+*    On Linux, Chrome previously stored credentials directly in the user's
+     Gnome Keyring or KWallet, but for technical reasons, it has switched to
+     storing the credentials in "Login Data" in the Chrome user's profile directory,
+     but encrypted on disk with a key that is then stored in the user's Gnome
+     Keyring or KWallet. If there is no available Keyring or KWallet, the data is
+     not encrypted when stored.
 *    On iOS, passwords are currently stored directly in the iOS Keychain and
      referenced from the rest of the metadata stored in a separate DB. The plan
      there is to just store them in plain text in the DB, because iOS gives