Fix broken DM link (discord#7432)

Author: colinloretz

docs/discord_social_sdk/development_guides/managing_game_invites.mdx

@@ -432,7 +432,7 @@ activity.SetSupportedPlatforms(
   <Card title="Managing Lobbies" link="#DOCS_DISCORD_SOCIAL_SDK_DEVELOPMENT_GUIDES_MANAGING_LOBBIES" icon="DoorEnterIcon">
     Bring players together in a shared lobby with invites, text chat, and voice comms.
   </Card>
-  <Card title="Sending Direct Messages" link="#DOCS_DISCORD_SOCIAL_SDK_DEVELOPMENT_GUIDES_MANAGING_GAME_INVITES" icon="InboxIcon">
+  <Card title="Sending Direct Messages" link="#DOCS_DISCORD_SOCIAL_SDK_DEVELOPMENT_GUIDES_SENDING_DIRECT_MESSAGES" icon="InboxIcon">
     Enable private messaging between players.
   </Card>
 </Container>