docs: fix textmatch broken link

[gkartalis]

Summary

When pressing the #TextMatch link in the docs under queries > options we aren't redirected anywhere due to capital letters included in the relative path of the header.

The same issue exists with the #Normalization link in the docs under precision.

Due to this the TextMatch and Normalization are not that visible and might cause confusion 🙈

This pr fixes both links.

Test plan

You can check the links provided below to test.

Broken	Fixed
https://callstack.github.io/react-native-testing-library/docs/api-queries/#Normalization	https://callstack.github.io/react-native-testing-library/docs/api-queries/#normalization
https://callstack.github.io/react-native-testing-library/docs/api-queries/#TextMatch	https://callstack.github.io/react-native-testing-library/docs/api-queries/#textmatch

[thymikee]

Thank you!