Documentation: Update examples explaining migration to fscad.fscad module

[petiesmo]

Instructional examples and cheat sheets still show "from fscad import *" Most recent update to code (a good one) breaks this call - the notes describe this change, but could not find it in the help documentation.

[JesusFreke]

Ah, yeah. Looks like I forgot to update the cheat sheet, I'll get that fixed. Thanks for the report!