Remove obsolete comment

kbhit.c

@@ -0,0 +1,19 @@
+/*
+ * Keyboard test program.
+ */
+
+#include <conio.h>
+
+int main(void)
+{
+    unsigned char c;
+
+    clrscr();
+    cputs("   Keyboard Test\r\n");
+
+    while (1) {
+        c = cgetc();
+        cputc(c);
+    }
+    return 0;
+}