add examples for Waveshare ESP32-S3-ETH PoE board

[btittelbach]

Description:

Finding the pins and documentation for this board is a bit like a scavenger hunt.
Adding the information to the documentation examples should make this easier for a lot of people.

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 /components/index.rst when creating new documents for new components or cookbook.

[coderabbitai]

Walkthrough

New configuration examples for the Waveshare ESP32-S3 ETH + OV2640 camera and the Waveshare ESP32-S3-ETH PoE Ethernet board have been added to the documentation. These examples provide explicit pin assignments and settings for each hardware component. No changes to code logic or public interfaces were made.

Changes

File(s)	Change Summary
components/esp32_camera.rst	Added a configuration example for the Waveshare ESP32-S3 ETH + OV2640 camera, detailing pin mappings.
components/ethernet.rst	Added a configuration example for the Waveshare ESP32-S3-ETH PoE board using the W5500 SPI chipset.

Suggested reviewers

• jesserockz

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📥 Commits

Reviewing files that changed from the base of the PR and between a103f13 and 2683552.

📒 Files selected for processing (2)

• components/esp32_camera.rst (1 hunks)
• components/ethernet.rst (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

`**`: - Do not generate or add any sequence diagrams

**: - Do not generate or add any sequence diagrams

• components/ethernet.rst
• components/esp32_camera.rst

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: build

🔇 Additional comments (2)

components/ethernet.rst (1)

318-329: Formatting looks consistent and complete for the new Ethernet example.
The Waveshare ESP32-S3-ETH PoE configuration follows the existing pattern, clearly specifies all W5500 SPI pins, and matches other entries in this section.

components/esp32_camera.rst (1)

505-525: Verify camera example pin assignments.
Please confirm that the OV2640 camera on the Waveshare ESP32-S3 is wired to these GPIOs and whether a reset_pin should also be included in the example.

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