doc: correct parameter type on 'subprocess.kill([signal])'

[himself65]

see #27750

Checklist

• documentation is changed or added
• commit message follows commit guidelines

[himself65]

node/lib/internal/child_process.js

Lines 461 to 486 in 030fa2e

	ChildProcess.prototype.kill=function(sig){
	constsignal=sig===0 ? sig :
	convertToValidSignal(sig===undefined ? 'SIGTERM' : sig);
	if(this._handle){
	varerr=this._handle.kill(signal);
	if(err===0){
	/* Success. */
	this.killed=true;
	returntrue;
	}
	if(err===UV_ESRCH){
	/* Already dead. */
	}elseif(err===UV_EINVAL||err===UV_ENOSYS){
	/* The underlying platform doesn't support this signal. */
	throwerrnoException(err,'kill');
	}else{
	/* Other error, almost certainly EPERM. */
	this.emit('error',errnoException(err,'kill'));
	}
	}
	/* Kill didn't succeed. */
	returnfalse;
	};

[ZYSzys]

Landed in 2e5bc80 🎉