docs(ai-agents): two grammar fixes in plugin examples

[memosr]

Summary

Two small grammar errors in example user prompts on the AI agents plugin documentation. Both prompts are shown prominently as "Try it" examples — they're the first interaction a developer has with the plugin docs.

Changes

docs/ai-agents/plugins/native/index.mdx:110

- Create a ETH/USDC LP position on Uniswap
+ Create an ETH/USDC LP position on Uniswap

ETH starts with a vowel sound when read aloud (ee-tee-aitch), so the indefinite article should be an. The same rule that gives us "an FBI agent" or "an MRI scan".

docs/ai-agents/plugins/native/avantis.mdx:31

- What's my Avantis open positions and PnL on Base?
+ What are my Avantis open positions and PnL on Base?

Subject-verb agreement. "positions" is plural, but "What's" expands to "What is" (singular). The sentence is asking about multiple positions, so it needs "What are".

Why this matters

Both fixes touch the "Try it" sections — the example prompts that show users what to type when first exercising a plugin. Grammar errors there are the first impression of doc quality, and these are the kinds of strings users may copy verbatim into their own integrations or screenshots.

Verification

• ✅ Two files modified, one line each
• ✅ No other content touched
• ✅ Both fixes are objectively correct grammar, not style preference

[cb-heimdall]

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