Docs: minor error in Falco.Markup docs

[sfinnie]

I think there's an error in the code sample under the heading "Combining views to create complex output". It currently reads:

// Template
let master (title : string) (content : XmlNode list) =
    Elem.html [ Attr.lang "en" ] [
        Elem.head [] [
            Elem.title [] [ Text.raw "Sample App" ]
        ]
        Elem.body [] content
    ]

That hard-codes the page title to "Sample App", whereas if I'm right(?) it should use the title parameter. Corrected code:

// Template
let master (title : string) (content : XmlNode list) =
    Elem.html [ Attr.lang "en" ] [
        Elem.head [] [
            Elem.title [] [ Text.raw title ]
        ]
        Elem.body [] content
    ]

Happy to submit a PR though realise it's a trivial change so might be overkill. Thanks.