Fix docs regarding cirque pinnacle attenuation

[preisi]

Description

With commit 5db705d the documentation for configuring the attenuation for the cirque pinnacle touchpad became out of date due to some code changes. This commit updates the docs accordingly to match the current code again.

Relevant code section:

qmk_firmware/drivers/sensors/cirque_pinnacle_regdefs.h

Lines 384 to 392 in f010af0

	#define EXTREG__TRACK_ADCCONFIG 0x0187
	// ADC-attenuation settings (held in BIT_7 and BIT_6)
	// 1X = most sensitive, 4X = least sensitive
	# define EXTREG__TRACK_ADCCONFIG__ADC_ATTENUATE_MASK 0xC0
	# define EXTREG__TRACK_ADCCONFIG__ADC_ATTENUATE_1X 0x00
	# define EXTREG__TRACK_ADCCONFIG__ADC_ATTENUATE_2X 0x40
	# define EXTREG__TRACK_ADCCONFIG__ADC_ATTENUATE_3X 0x80
	# define EXTREG__TRACK_ADCCONFIG__ADC_ATTENUATE_4X 0xC0
	#define EXTREG__TRACK_ADCCONFIG_DEFVAL 0x4E

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).