[R2] Update docs for notification commands

[harshil1712]

Update docs for the notification command and add example for the --prefix and --suffix command.

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Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/wrangler/commands/	https://r2-notification-update.cloudflare-docs-7ou.pages.dev/workers/wrangler/commands/
https://developers.cloudflare.com/r2/buckets/event-notifications/	https://r2-notification-update.cloudflare-docs-7ou.pages.dev/r2/buckets/event-notifications/

[harshil1712]

Closing this in favour of #16392