__riscv_flush_icache() still ignores the address range in 6.12.

Change-Id: I70ded58e361a0e407ab1dfd3d9488d83f86f2987
diff --git a/libc/include/sys/cachectl.h b/libc/include/sys/cachectl.h
index b5fabe3..d06d683 100644
--- a/libc/include/sys/cachectl.h
+++ b/libc/include/sys/cachectl.h
@@ -48,7 +48,7 @@
 
 /**
  * __riscv_flush_icache(2) flushes the instruction cache for the given range of addresses.
- * The address range is currently (Linux 6.4) ignored, so both pointers may be null.
+ * The address range is currently (Linux 6.12) ignored, so both pointers may be null.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */