docs(components/link): add missing information to Relative section

[OlegDev1]

• Updated the Relative section. Added a missing part about index routes behaviour when using relative links. It was mentioned in this issue - [Docs]: description of relative link behavior is incorrect for index routes #12122
• Fixed a typo
• Changed examples in Relative section from js to ts

[changeset-bot]

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Latest commit: 65809b9

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