deployment: simplify layout/overlay guide wording per Orwell style rules

[dan-starkware]

Prose-only edits to deployments/sequencer/docs/LAYOUT_OVERLAY_CONFIGURATION.md, applying Orwell's writing rules. No facts, numbers, or names changed.

• Line 3: cut different from across different environments.
• Line 555: comprehensive → complete.

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https://claude.ai/code/session_01GjrAzEXJmrgsDjg9YSA1c6

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Generated by Claude Code

[cursor]

PR Summary

Low Risk
Documentation-only copy edits with no impact on deployment behavior or configuration semantics.

Overview
Prose-only edits to LAYOUT_OVERLAY_CONFIGURATION.md for clearer, simpler wording (Orwell-style). No behavioral or factual changes.

The intro now says configurations are managed across environments instead of across different environments. Under Best Practices, the first bullet uses Keep layouts complete instead of Keep layouts comprehensive.

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[reviewable-StarkWare]

This change is