Tweak syntax for page name refs

[lubegasimon]

Fixes #590

[jonludlam]

It'd be good to add some test cases to the parser tests - test/parser/test.ml, since when we remove the parser these tests will go with it.

[lubegasimon]

It'd be good to add some test cases to the parser tests - test/parser/test.ml, since when we remove the parser these tests will go with it.

Indeed, I’ll surely address this in an independent PR

[jonludlam]

Thanks!