It helps if the code actually works in the first place. Your second bit of code wont compile because you haven't actually included the Servo library - you just put #include with nothing after it.
Anyway, you can use arrays, for example:
#include "Servo.h"
Servo myservo[5]; // create servo object to control a servo
void setup() {
Serial.begin(9600);
for (byte i = 0; i < 5; i++){
myservo[i].attach(i+2);
}
}
void loop()
{
if(Serial.available() >=5) {
byte servoAng[5];
for (byte i = 0; i < 5; i++){
servoAng[i] = Serial.read();
myServo[i].write(servoAng[i]);
}
}
}
Have a go at changing the first peice of code to use arrays in a similar fasion to this peice. You will learn more if you have a go yourself.