Remove "automatically" from provisional account docs (discord#7459)

We had previously stated that provisional accounts where updated
automatically.

This actually isn't true, so removing it.

Author: markmandel

docs/discord-social-sdk/development-guides/using-provisional-accounts.mdx

@@ -40,7 +40,6 @@ Before you begin, make sure you have:
 
 Think of provisional accounts as temporary Discord accounts that:
 
-- Are created automatically for your players
 - Work only with your game
 - Can be upgraded to full Discord accounts later
 - Persist between game sessions