Fix grammatical errors in concepts/architecture documentation

[devin-ai-integration]

Fix grammatical errors in concepts/architecture documentation

Summary

This PR fixes three grammatical errors found during a comprehensive review of all documentation files in the concepts/architecture folder:

1. cannon.mdx (line 166): Removed awkward parentheses - changed "separate action(s) need(s) to be performed" to "separate actions need to be performed"
2. challenger.mdx (line 55): Removed unnecessary comma - changed "The set of honest responses, contains" to "The set of honest responses contains"
3. outages.mdx (line 136): Removed duplicate conjunction - changed "during the downtime and but the Sequencer" to "during the downtime but the Sequencer"

All technical content, code snippets, URLs, and markdown formatting remain unchanged.

Review & Testing Checklist for Human

• Verify the grammatical changes improve readability without altering the intended meaning
• Confirm the fixes are consistent with the documentation style guide

Notes

• Reviewed all 9 documentation files in concepts/architecture (including subfolders)
• No other grammatical errors were found in: explainer.mdx, fp-components.mdx, mips.mdx, reorg.mdx, derivation-pipeline.mdx, overview.mdx
• Link to Devin run: https://app.devin.ai/sessions/6f573fae44014d20ad38499199a726f9
• Requested by: Ariel Diaz (@aliersh)

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