[Workflows] docs: fix note syntax

[sugar-cat7]

Summary

Updates the syntax of the note block.

• From: :::note "Service Bindings vs. fetch"
• To: :::note[Service Bindings vs. fetch]

Screenshots (optional)

Before
https://developers.cloudflare.com/workflows/build/call-workflows-from-pages/#using-fetch

After

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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