docs: update feature matrix — ALTER/DESCRIBE STYLING now working (#631)

Flip the Styling row to reflect the fix: DESCRIBE and ALTER now Y (the
casing bug that broke DESCRIBE STYLING is fixed, and ALTER STYLING sets/
removes/clears design properties via the mutator), and Examples/Tests now Y.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: peterjumpnl

docs/01-project/MDL_FEATURE_MATRIX.md

@@ -187,7 +187,7 @@ Document types that exist in Mendix but have no MDL support:
 |---------|------|----------|--------|-----------|------|-------|----------|-------|---------|------|-----|--------|------|-----|------|--------|----------|-------|
 | **Microflow activities** | - | - | P | - | - | - | 02 | Y | P | P | P | Y | Y | - | - | - | P | 60+ activities supported; some edge cases missing |
 | **Building blocks** | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | Reusable page building blocks |
-| **Styling** | P | P | P | N | N | N | N | N | N | N | N | P | N | P | N | N | N | Class/Style/DesignProperties on widgets; full theme system not yet |
+| **Styling** | P | Y | P | N | N | Y | Y | Y | N | N | N | P | N | P | N | N | N | Class/Style/DesignProperties on widgets via ALTER STYLING (#631); full theme system not yet |
 | **Extensions** | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | Mendix extensions / add-ons |
 | **Custom JS actions** | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | JavaScript actions for nanoflows |
 | **Custom widgets** | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | Pluggable widget packages |