Update UART pin count for ESP32 documentation

[nagyrobi]

https://docs.espressif.com/projects/esp-idf/en/stable/esp32p4/api-reference/peripherals/uart.html

Description

ESP32-P4 supports 5+1 uarts, not just 3: https://docs.espressif.com/projects/esp-idf/en/stable/esp32p4/api-reference/peripherals/uart.html

Related issue (if applicable): fixes

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

• esphome/esphome#

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.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 96675366-55ed-4ed5-97ba-b432fd5c0ad8

📥 Commits

Reviewing files that changed from the base of the PR and between 42c0f7c and af352f7.

📒 Files selected for processing (1)

• src/content/docs/components/esp32.mdx

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Walkthrough

This PR updates the ESP32 hardware documentation to correct the UART interface count for the ESP32-P4 variant from 3 to 5 full-featured UARTs plus 1 lite UART in the component specification table.

Changes

ESP32-P4 Hardware Specification

Layer / File(s)	Summary
ESP32-P4 UART specification update src/content/docs/components/esp32.mdx	The documented UART count for ESP32-P4 is updated from 3 to 5 full-featured UARTs plus 1 lite UART in the hardware capabilities table.

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating UART documentation for ESP32, which matches the changeset that modifies ESP32-P4 UART specifications.
Description check	✅ Passed	The description is directly related to the changeset, explaining that ESP32-P4 supports 5+1 UARTs instead of 3, with reference to official Espressif documentation.
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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nagyrobi-patch-1

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