fix typo Update 1785-clarify-ethermint-keys.md

[VitalikBerashvili]

Pull Request Title:

Fix typo in 1785-clarify-ethermint-keys.md

Description:

This pull request corrects a typo in the 1785-clarify-ethermint-keys.md file. The term "documention" was corrected to "documentation" for better accuracy.

Changes:

• Fixed typo: "documention" → "documentation" in the 1785-clarify-ethermint-keys.md file.

Type of Change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update (non-breaking change to documentation)
• Other (please specify):

Related Issues:

Fixes issue # (add issue number here if relevant)

Checklist:

• I have read the contributing guidelines.
• I have tested my changes locally.
• I have updated the documentation (if applicable).
• I have ensured that my changes do not break any existing tests.