Clarify route precedence in routing.mdx

[mb21]

Description (required)

• Clarify what "them" and "in order" exactly refer to.
• "Routes with ... will take precedence over less specific routes" -> seems like a circular definition, since "precedence" and "specificity" seem to refer to the same thing here...

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Name	Status	Preview	Updated (UTC)
docs	🛑 Canceled (Inspect)		Jan 23, 2024 9:18am

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[sarah11918]

Docs is happy with the existing wording here!

[mb21]

Any rationale? Maybe you wanna take a look at how many people are confused about this, e.g. in withastro/astro#9757