Fixing a typo on Update advantages.rst

[xela144]

Current advantages.rst embeds the wrong lines from examples/intersecting_pipes.py. With these changes, the lines you would see are

from build123d import *

with BuildPart() as pipes:
    box = Box(10, 10, 10, rotation=(10, 20, 30))
    with BuildSketch(*box.faces()) as pipe:
        Circle(4)
    extrude(amount=-5, mode=Mode.SUBTRACT)
    with BuildSketch(*box.faces()) as pipe:
        Circle(4.5)
        Circle(4, mode=Mode.SUBTRACT)
    extrude(amount=10)
    fillet(pipes.edges(Select.LAST), 0.2)

If you view the advantages.rst page today, you'll see what I'm talking about:

[jdegenstein]

Merged, thank you for noticing and fixing this issue!