Update stepper-library-examples.md

[gilgvirts]

What This PR Changes

Description:
The default Stepper library examples often use the sequence (8, 9, 10, 11). However, for the widely used 28BYJ-48 stepper motor paired with the ULN2003 driver board, this sequence causes vibration without rotation.

Updating the pin definition to (8, 10, 9, 11) correctly sequences the internal coils, ensuring smooth rotation as intended by the tutorial.

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