Docs copy cleanup — banned-word + marketing-copy rewrites

[vraspar]

Two small copy issues surfaced during the x402r-sdk PR #123 (authCapture migration) Round 4 review. Filing here since both are in this repo, not the SDK.

index.mdx:7 — banned word "enables"

Current (line 7):

x402r is a refundable payments protocol extension for x402. It enables secure, reversible transactions with built-in buyer protection through smart contract escrow on Base.

The reviewer's suggested rewrite swapped "It enables" → "x402r adds":

x402r adds secure, reversible transactions with built-in buyer protection through smart contract escrow on Base.

Either way works for the banned-word fix. Whoever picks this up should also match the broader writing-style preference: flowing prose, no scaffolding, no "worth flagging" filler, no em dashes if you can avoid them.

sdk/limitations.mdx:5 — marketing copy

Current (line 5):

The SDK provides full coverage of core payment flows...

Reviewer's rewrite:

Core payment flows (authorization, capture, charge, refund, dispute resolution, evidence submission) are fully supported. This page documents known limitations.

The rewrite is more direct and concrete. Same style preference applies.

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Both items are low-priority style nits; not blocking anything. Filed during the x402r-sdk PR #123 Round 4 review since the reviewer correctly tagged them out of that PR's scope.

PR #123: BackTrackCo/x402r-sdk#123
Round 4 review: BackTrackCo/x402r-sdk#123 (comment)