docs: make route matching/filtering information more visible

### Current State

Route matching related information is given here: https://apisix.apache.org/docs/apisix/router-radixtree/ but the page that contains this information is not much visible.

### Desired State

To fix this I raised this PR: https://github.com/apache/apisix/pull/10413, but it didn't seem like a good solution. Anyone interested can take a look at the conversation to find a better way to address this problem.

Start by reviewing the route-matching information in the router-radixtree documentation page and the discussion in PR #10413. Determine a better way to make that information visible without repeating the rejected approach. Done means the relevant route matching and filtering guidance is easier to find in the documentation.

Written by the indexing model from the issue text.