Misc. typo fixes

Various workbenches

src/Mod/Drawing/DrawingPatterns.py

@@ -83,7 +83,7 @@ AutocadPatterns = {
     "AR-RROOF":"", # seemingly random lines
     "AR-RSHKE":"", # seemingly random tiles
     "AR-SAND":"sand",
-    "BOX":"", # stupid unuseful square-inside-square
+    "BOX":"", # stupid useless square-inside-square
     "BRASS":"", # horizontal ansi33
     "BRICK":"brick",
     "BRSTONE":"", # material symbol

src/Mod/Drawing/Gui/TaskOrthoViews.cpp

@@ -463,7 +463,7 @@ void OrthoViews::calc_scale()                               // compute scale req
 
 void OrthoViews::calc_offsets()                             // calcs SVG coords for centre of upper left view
 {
-    // space_x is the emptry clear white space between views
+    // space_x is the empty clear white space between views
     // gap_x is the centre - centre distance between views
 
     float space_x = (page_dims[2] - scale * layout_width) / num_gaps_x;