fix comments in include/h2o/ebpf.h
#define h2o__ebpf_h
/*
- * This file may be included in a BPF program. A BPF program can be written in C, which can includes a few system headers, for
- * example linux/sched.h and inttypes.h, and most of standard C/POSIX headers, for example stdio.h and socket.h, are not available.
+ * This file may be included by a BPF program. A BPF program written in C can include a few system headers, for example
+ * linux/sched.h and inttypes.h. However, most of the standard C/POSIX headers, for example stdio.h and socket.h, are unavailable.
+ * ebpf.h MUST only depend on the include files available to the BPF compiler.
*/
// max(sizeof(struct in6_addr), sizeof(struct in_addr))
