Revise accessibility actions and label field description

[aryanchoudharypro]

PR Description

Summary

This PR modernizes the accessibilityActions documentation by correcting outdated Android TalkBack interaction patterns and clarifying the functionality of the label field for standard actions.

The Problem

1. Outdated Gestures (TalkBack 9.1+):** The current documentation incorrectly states that Android users must use physical volume buttons to trigger increment and decrement actions. This behavior was replaced by the "Adjust Reading Control" vertical swipe gestures in TalkBack 9.1 (released in early 2021). The legacy behavior is nearly five years out of date.
2. Misleading label Documentation: The docs previously claimed the label field for standard actions is "generally unused." This is incorrect; TalkBack uses this field to override the default "Double tap to activate" hint with a custom, context-specific description (e.g., "Double tap to open chat").

The Fix

• Updated increment/decrement: Reflected the shift from hardware volume keys to vertical swipe gestures for TalkBack 9.1 and later, while maintaining the historical context for older versions.
• Clarified label Usage: Revised the description to explain how the label field is utilized by assistive technologies to provide specific action results to the user, particularly in overriding the default activation hint.

[meta-cla]

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