Fix capitalization of "Execution fee" in fees page

[vezzabel]

Changes "Relay's fee" to "the Execution fee" in the execution fees section for consistency with the named fee type introduced earlier in the same paragraph.

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Generated by Claude Code

[github-actions]

Claude finished @vezzabel's task in 37s —— View job

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Code Review — PR #338

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Summary: Single-line wording fix in references/api/api_core_concepts/fees.mdx. The text now refers to "the Execution fee" instead of "Relay's fee", matching the named fee type (Execution Fees) defined at the top of the same numbered section.

✅ Looks good.

• Correctness: Accurate. The surrounding bullets describe origin gas as included only for gasless transactions; clarifying that for regular transactions it's "not part of the Execution fee" (rather than the vaguer "Relay's fee") is precise and consistent with the section heading on line 8.
• Consistency: Good improvement — the page defines three named buckets (Execution Fees, Swap Fees, Relay Fees), and "Relay's fee" was ambiguous against the distinct Relay Fees type. Referring to the Execution fee removes that ambiguity.
• Style guide: No violations. The fees page is an API concept page (§3.3a) and the change touches only prose; no terminology rule in §5 is affected.

Minor nit (non-blocking): The named type is titled "Execution Fees" (plural) while the new sentence uses "Execution fee" (singular, lowercase f). This reads naturally in prose and I wouldn't change it, but if you want strict casing parity with the heading you could write "Execution Fees". Not worth a revision on its own.

No changes needed — this is ready to merge.

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