docs: fix typos in delegator, governance, and lsm-staking documentation

[cypherpepe]

Description

This PR introduces corrections for typos found in multiple documentation files. The critical files to review are:

• delegator-faq.md
• delegator-security.md
• text-prop.md
• lsm-staking.md

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Author Checklist

I have...

• included the correct docs: prefix in the PR title
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

I have...

• Confirmed the correct docs: prefix in the PR title
• Confirmed all author checklist items have been addressed
• Confirmed that this PR only changes documentation
• Reviewed content for consistency
• Reviewed content for thoroughness
• Reviewed content for spelling and grammar
• Tested instructions (if applicable)

Comparing changes:
The PR fixes spelling mistakes across multiple documentation files to improve clarity and professionalism. This includes corrections such as plaftorm → platform, kyes → keys, and more.