Unify libc header descriptions

libc/include/bits/errno-return.h

@@ -1,4 +1,4 @@
-/* bits/errno-return.h: Provides a convenient way of setting errno after a syscall. */
+/* bits/errno-return.h: A convenient way of setting errno after a syscall. */
 
 #ifndef _BITS_ERRNO_RETURN_H
 #define _BITS_ERRNO_RETURN_H

libc/include/bits/timespec.h

@@ -1,4 +1,4 @@
-/* bits/timespec.h: Defines the timespec structure. */
+/* bits/timespec.h: The timespec structure. */
 
 #ifndef _BITS_TIMESPEC_H
 #define _BITS_TIMESPEC_H

libc/include/ctype.h

@@ -1,4 +1,4 @@
-/* ctype.h: Character handling functions. */
+/* ctype.h: Character handling. */
 
 #ifndef _CTYPE_H
 #define _CTYPE_H

libc/include/sys/syscall.h

@@ -1,9 +1,10 @@
-/* sys/syscall.h: Defines syscall numbers. */
+/* sys/syscall.h: Syscall constants. */
 
 #ifndef _SYS_SYSCALL_H
 #define _SYS_SYSCALL_H
 
 /* This header just forwards to luna/Syscall.h, which is used in the kernel as well. */
 #include <luna/Syscall.h>
+#undef enumerate_syscalls
 
 #endif

libc/include/time.h

@@ -1,4 +1,4 @@
-/* time.h: Time management functions. */
+/* time.h: Time management. */
 
 #ifndef _TIME_H
 #define _TIME_H