chore: Update upgrading-from-framework.mdx

https://discord.com/channels/802917734999523368/802993458289180693/1148519259727736892

app/pages/docs/upgrading-from-framework.mdx

@@ -275,7 +275,7 @@ In your `types.ts` file, you'll need to change the module that is being
 augmented:
 
 ```diff
-- declare module "@blitzjs/auth" {
+- declare module "blitz" {
 + declare module "@blitzjs/auth" {
     export interface Session {
       // ...