[docs] additional clarification about createIndexFiles: false

[benmccann]

closes #3725

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[Rich-Harris]

This realisation is a few days too late, but kit.prerender.createIndexFiles is the wrong option. It belongs to adapter-static, not to Kit itself (other adapters might want to set it depending on the value of trailingSlash). We should fix that instead of changing the docs

[Rich-Harris]

#3799

[iham]

@Rich-Harris good point!
having the hint how to deal with endpoints /a-page converted to a-page.html when using createIndexFiles is set to false would be nice.

some mentioning that this can be a thing to setup in your webserver or some services already do it that way (like gh-pages)

my local nginx used for testing needs to be configured correctly to deal with that using try_files $uri $uri.html $uri/index.html =404; for example.