Extend Pages Functions Redirects docs to mention file extensions

[marcelgerber]

Existing documentation URL(s)

• https://developers.cloudflare.com/pages/configuration/redirects/#placeholders

What changes are you suggesting?

Mention support for file extensions in dynamic redirect rules with placeholders, like so:

/assets/:name.svg https://static-assets.example.org/svg/:name.svg 301
/assets/:name.png https://static-assets.example.org/png/:name.png 301
/assets/:name https://static-assets.example.org/other/:name 301

Additional information

No response