[doc-corrections] On Layout tutorial, minor corrections needed

[nmingotti]

I found a few little mistakes in the layout tutorial. This is to remind me (or anybody who has free hands) to re-read all and make the appropriate changes. https://github.com/Cuis-Smalltalk/Learning-Cuis/blob/master/LayoutTour.md https://github.com/Cuis-Smalltalk/Learning-Cuis/blob/master/LayoutTourPart2.md

[nmingotti]

. Corrected all part-1, merged by KenD, that should be ok TODO There remains to see part-2, i saw KenD made a few corrections in last hours to is so my printed document is outdated. So i need to re-print, re-read, close this issue when done.