Fix Typos in Documentation Files

[Dimitrolito]

This pull request addresses several typographical errors and stylistic inconsistencies in multiple documentation files. The changes improve clarity, grammar, and adherence to language standards. Below are the details of the changes made:

Files Updated

1. adr-001-interchain-accounts.md

   • Corrected "a Authentication Module" to "an Authentication Module" to match proper article usage.
   • Removed redundant phrase "to contract to contract" to improve readability.

2. delegator-faq.md

   • Updated "3 week" to "3-week" for proper usage of hyphens in adjectival compounds.

3. ledger.md

   • Changed "double check" to "double-check" to align with the correct spelling of the verb.

Summary of Changes

• Improved grammatical correctness and consistency across documentation.
• Enhanced clarity and professionalism in the written content.

These changes do not affect production code and are limited to improving the documentation for better comprehension and readability.