fix: Update "How Should I Query?" links to use the correct URLs

[ryanjwessel]

This addresses #579

Summary

This updates the "How Should I Query?" links to use the correct URLs for each query type.

Test plan

I verified these URLs are all correct.

[thymikee]

Wouldn't prefixing the existing links with /docs/ help? If not, we can leave absolute paths, but relative would be preferable

[ryanjwessel]

I tested while running the website locally, and prefixing with docs/ results in this URL (note the duplicate docs/): http://localhost:3000/react-native-testing-library/docs/docs/api-queries#bytext

Turns out, the relative paths were working locally, but when they are hosted in production they are incorrect.

Local relative path: http://localhost:3000/react-native-testing-library/docs/api-queries#bytext
Production relative path: https://callstack.github.io/react-native-testing-library/docs/how-should-i-query/api-queries#bydisplayvalue

Given that, it probably makes sense to default to using absolute paths, unless the relative path is included in the same Markdown file.