Recommended changes to: http://arduino.cc/en/Reference/Servo
I suggest changing the first sentence of the servo reference page from: “This library allows an Arduino board to control one or two RC (hobby) servo motors.” To: “This library allows an Arduino board to control RC (hobby) servo motors.”
Also, the text in the Circuit section should mention that servo motors can draw considerable current and an external power supply may be required to drive more than one or two servos. When using external power, the ground of the supply must be connected to Arduino and servo grounds. The fritzing example diagram can be used to illustrate connection for a single servo. Something like this would be useful to show how to connect external power.