fmt: align the default values of the enum fields

[yuyi98]

This PR align the default values of the enum fields.

enum Signo {
	sighup    = 1 // Hangup.
	sigint    = 2 // Interactive attention signal.
	sigquit   = 3 // Quit.
	sigill    = 4 // Illegal instruction.
	sigtrap   = 5 // Trace/breakpoint trap.
	sigabrt   = 6 // Abnormal termination.
	sigbus    = 7
	sigfpe    = 8 // Erroneous arithmetic operation.
	sigkill   = 9 // Killed.
	sigusr1   = 10
	sigsegv   = 11 // Invalid access to memory.
	sigusr2   = 12
	sigpipe   = 13 // Broken pipe.
	sigalrm   = 14 // Alarm clock.
	sigterm   = 15 // Termination request.
	sigstkflt = 16
	sigchld   = 17
	sigcont   = 18
	sigstop   = 19
	sigtstp   = 20
	sigttin   = 21 // Background read from control terminal.
	sigttou   = 22 // Background write to control terminal.
	sigurg    = 23
	sigxcpu   = 24 // CPU time limit exceeded.
	sigxfsz   = 25 // File size limit exceeded.
	sigvtalrm = 26 // Virtual timer expired.
	sigprof   = 27 // Profiling timer expired.
	sigwinch  = 28
	sigpoll   = 29
	sigsys    = 31
}

[spytheman]

Excellent!