Assembly aids clarification for the SB manual

[FreeWilly2022]

The final assembly of the SB includes some very clever assembly aids that can be confusing, especially when going back and doing maintenance. I suggest some additional explanation be added:

Page 61 - next to the 3 mm clearance, add "Note: these are assembly aids, do not tighten later"
Page 62 - add "Note: the probe mounting can be reversed, with the screws installed from the rear, to allow adjusting the height without removing the hot end."
Page 64 - next to the diagram on the left add an arrow pointing down, and add "Slide the CW2 down the face of the X carriage until it seats just above the belts. The x carriage has tabs that will help hold it in place until it is secured in the next step."
Page 66 - add an arrow that swoops up and clockwise, and add "Install the hot end by inserting the PTFE tube into the extruder, then catch the tabs on the two screws installed earlier, and rotate the bottom until it catches on the small shelf at the bottom of the x carriage."