docs: remove Last updated lines

docs/features.md

@@ -2,8 +2,6 @@
 
 Per-feature documentation for the GKI2 kernels built from this repository.
 
-*Last updated: 2026-09-01*
-
 ---
 
 ## Root Implementations

docs/supported-devices.md

@@ -8,8 +8,6 @@
 
 ## Google Pixel
 
-*Last updated: 2026-09-01.*
-
 | Device | Codename | GKI Kernel | Firmware | Status |
 |--------|----------|------------|----------|--------|
 | Pixel 6 | oriole | android14-6.1 | stock | Supported · 2026-08-30 |