[pcf8563] Fix default I2C address from 0xA3 to 0x51

[swoboda1337]

Description

Fix the documented default I2C address for the PCF8563 RTC from 0xA3 (8-bit read address from datasheet) to 0x51 (7-bit address used by ESPHome's I2C layer).

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

• esphome/esphome#PENDING

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.

[Copilot]

Pull request overview

Fixes the documented default I²C address for the PCF8563 RTC in the ESPHome docs, aligning it with the 7-bit address format used by ESPHome’s I2C layer.

Changes:

• Update the pcf8563 time component docs to use 0x51 as the default address instead of 0xA3.

[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: c2a67317-3ed1-472f-8b8a-7a6821c56323

📥 Commits

Reviewing files that changed from the base of the PR and between b5d38db and 390aa70.

📒 Files selected for processing (1)

• src/content/docs/components/time/pcf8563.mdx

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Walkthrough

Updated the PCF8563 real-time clock component documentation to correct the default I²C address from 0xA3 to 0x51 in the configuration variable reference.

Changes

Cohort / File(s)	Summary
Documentation Update src/content/docs/components/time/pcf8563.mdx	Corrected the default I²C address value for the address configuration variable from 0xA3 to 0x51.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested labels

current

Suggested reviewers

• jesserockz

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: fixing the documented default I2C address for the PCF8563 component from 0xA3 to 0x51, which aligns perfectly with the changeset.
Description check	✅ Passed	The description is directly related to the changeset, providing context about the I2C address correction (8-bit vs 7-bit address format) and referencing the corresponding ESPHome repository pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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