[emontx] Update UART RX/TX pins to GPIO20/GPIO21 for emonWifi

[FredM67]

Description

Update the UART pin assignments in all sample YAML configurations from GPIO16 (RX) / GPIO17 (TX) to GPIO20 (RX) / GPIO21 (TX), which are the pins used on the emonWifi expansion board.

Related issue (if applicable): N/A

Pull request in esphome with YAML changes (if applicable):

• N/A

Checklist

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /src/content/docs/components/index.mdx when creating new documents for new components or cookbook.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: 8de2e520-ead3-4438-9ad7-00742b7cde26

📥 Commits

Reviewing files that changed from the base of the PR and between 554a0d8 and 9d400f5.

📒 Files selected for processing (1)

• src/content/docs/components/sensor/emontx.mdx

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Walkthrough

Documentation updates to the EmonTx component hub guide: two UART configuration examples now specify GPIO20 and GPIO21 instead of GPIO16 and GPIO17 for UART RX and TX pins respectively.

Changes

Documentation: EmonTx UART GPIO Pin Corrections

Layer / File(s)	Summary
Documentation Updates src/content/docs/components/sensor/emontx.mdx	Component/Hub UART example (lines 43–44) and Quick Start example (lines 95–96) updated with corrected GPIO pins: rx_pin: GPIO20 and tx_pin: GPIO21 replace GPIO16 and GPIO17.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: updating UART pins from GPIO16/GPIO17 to GPIO20/GPIO21 for the emonWifi expansion board in the emontx documentation.
Description check	✅ Passed	The description is directly related to the changeset, providing clear context about the UART pin updates and specifying the hardware context (emonWifi expansion board).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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