Typo fix Update adr-002-ipld-da-sampling.md

[santamasa]

Description

Fix Typographical Errors in Function Descriptions

This pull request addresses and fixes critical typographical errors in the descriptions of several functions that affect code clarity and correctness.

Fixed Issues:

1. Typo in "contex.Context":
   • In the descriptions of the following functions: ValidateAvailability, RetrieveBlockData, and PutBlock, the reference to "contex.Context" has been corrected to "context.Context".
   • Importance: This correction is crucial as the incorrect spelling could lead to confusion or misinterpretation of the intended type, especially for developers referencing or using these functions. Proper naming ensures clarity, adherence to Go standards, and minimizes potential errors or misunderstandings in documentation and code navigation.

PR checklist

• Tests written/updated
• Changelog entry added in .changelog (we use
  unclog to manage our changelog)
• Updated relevant documentation (docs/ or spec/) and code comments

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Please review and consider merging this fix. Thank you!

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