feat(matter_docs): Enhance README with callback usage details

Clarify the importance of calling setLiftPercentage() and setTiltPercentage() in callbacks to update CurrentPosition attributes. Expand on callback flow and provide details on target position callbacks.

Author: SuGlider

libraries/Matter/examples/MatterWindowCovering/README.md

@@ -148,9 +148,14 @@ For production use with a motorized window covering:
    - Use encoders or limit switches to provide position feedback
    - For lift: Update `currentLift` (cm) based on actual motor position
    - For tilt: Update `currentTiltPercent` (rotation percentage) based on actual motor rotation
-   - Call `setLiftPercentage()` and `setTiltPercentage()` to update `CurrentPosition` attributes (these methods update the device's actual position, not the target)
+   - **Important**: Call `setLiftPercentage()` and `setTiltPercentage()` in your `onGoToLiftPercentage()` or `onGoToTiltPercentage()` callbacks to update `CurrentPosition` attributes when the physical device actually moves. This will trigger the `onChange()` callback if registered.
    - Call `setOperationalState(LIFT, STALL)` or `setOperationalState(TILT, STALL)` when movement is complete to indicate the device has reached the target position
    - Configure installed limits using `setInstalledOpenLimitLift()`, `setInstalledClosedLimitLift()`, `setInstalledOpenLimitTilt()`, and `setInstalledClosedLimitTilt()` to define the physical range of your window covering
+   
+   **Callback Flow:**
+   - Matter command → `TargetPosition` changes → `onGoToLiftPercentage()`/`onGoToTiltPercentage()` called
+   - Your callback moves the motor → When movement completes, call `setLiftPercentage()`/`setTiltPercentage()`
+   - `setLiftPercentage()`/`setTiltPercentage()` update `CurrentPosition` → `onChange()` called (if registered)
 
 3. **Window Covering Type**:
    - Pass the covering type to `begin()` to configure the appropriate type (e.g., `BLIND_LIFT_AND_TILT`, `ROLLERSHADE`, etc.)
@@ -198,12 +203,18 @@ The MatterWindowCovering example consists of the following main components:
 2. **`loop()`**: Checks the Matter commissioning state, handles button input for manual lift control and factory reset, and allows the Matter stack to process events.
 
 3. **Callbacks**:
-   - `fullOpen()`: Handles open command - moves window covering to fully open (100% lift), updates `CurrentPosition`, and sets operational state to `STALL`
-   - `fullClose()`: Handles close command - moves window covering to fully closed (0% lift), updates `CurrentPosition`, and sets operational state to `STALL`
-   - `goToLiftPercentage()`: Handles lift percentage changes (0-100%), calculates absolute position (cm) based on installed limits, updates `CurrentPosition`, and sets operational state to `STALL` when movement is complete
-   - `goToTiltPercentage()`: Handles tilt rotation percentage changes (0-100%), updates `CurrentPosition`, and sets operational state to `STALL` when movement is complete
-   - `stopMotor()`: Handles stop command - stops any ongoing movement, updates `CurrentPosition` for both lift and tilt, and sets operational state to `STALL` for both
-   - `visualizeWindowBlinds()`: Updates RGB LED to reflect current lift and tilt positions
+   
+   **Target Position Callbacks** (called when `TargetPosition` attributes change):
+   - `fullOpen()`: Registered with `onOpen()` - called when `UpOrOpen` command is received. Moves window covering to fully open (100% lift), calls `setLiftPercentage()` to update `CurrentPosition`, and sets operational state to `STALL`
+   - `fullClose()`: Registered with `onClose()` - called when `DownOrClose` command is received. Moves window covering to fully closed (0% lift), calls `setLiftPercentage()` to update `CurrentPosition`, and sets operational state to `STALL`
+   - `goToLiftPercentage()`: Registered with `onGoToLiftPercentage()` - called when `TargetPositionLiftPercent100ths` changes (from commands, `setTargetLiftPercent100ths()`, or direct attribute writes). Calculates absolute position (cm) based on installed limits, calls `setLiftPercentage()` to update `CurrentPosition`, and sets operational state to `STALL` when movement is complete
+   - `goToTiltPercentage()`: Registered with `onGoToTiltPercentage()` - called when `TargetPositionTiltPercent100ths` changes. Calls `setTiltPercentage()` to update `CurrentPosition`, and sets operational state to `STALL` when movement is complete
+   - `stopMotor()`: Registered with `onStop()` - called when `StopMotion` command is received. Stops any ongoing movement, calls `setLiftPercentage()` and `setTiltPercentage()` to update `CurrentPosition` for both, and sets operational state to `STALL` for both
+   
+   **Current Position Callback** (called when `CurrentPosition` attributes change):
+   - `onChange()`: Registered with `onChange()` - called when `CurrentPositionLiftPercent100ths` or `CurrentPositionTiltPercent100ths` change (after `setLiftPercentage()` or `setTiltPercentage()` are called). Updates RGB LED visualization to reflect current positions
+   
+   **Note:** The Target Position callbacks (`fullOpen()`, `fullClose()`, `goToLiftPercentage()`, `goToTiltPercentage()`, `stopMotor()`) call `setLiftPercentage()` or `setTiltPercentage()` to update the `CurrentPosition` attributes. This triggers the `onChange()` callback, which updates the visualization.
 
 ## Troubleshooting
 
@@ -225,3 +236,4 @@ The MatterWindowCovering example consists of the following main components:
 ## License
 
 This example is licensed under the Apache License, Version 2.0.
+