doc fixes

miscellaneous.scad

@@ -246,7 +246,7 @@ module path_extrude(path, convexity=10, clipsize=100) {
 // Synopsis: Extrudes 2D children outwards around a cylinder.
 // SynTags: Geom
 // Topics: Miscellaneous, Extrusion, Rotation
-// See Also: heightfield(), cylindrical_heightfield(), cyl()
+// See Also: cyl(), plot_revolution()
 // Usage:
 //   cylindrical_extrude(ir|id=, or|od=, [size=], [convexity=], [spin=], [orient=]) 2D-CHILDREN;
 // Description:

rounding.scad

@@ -2580,8 +2580,8 @@ function _circle_mask(r) =
 //   around the curve of the cylinder.  The angular span of the path on the cylinder must be somewhat
 //   less than 180 degrees, and the path shouldn't have closely spaced points at concave points of high curvature because
 //   this causes self-intersection in the mask polyhedron, resulting in CGAL failures.  The path also cannot include
-//   sharp corners, because it internally uses {{offset()}} which will expand those sharp corners into very long single
-//   segments that produce incorrect result.  
+//   sharp corners, because it internally uses {{offset()}} which expands those sharp corners into long single
+//   segments that produce incorrect results.
 // Arguments:
 //   r / radius = center radius of the cylindrical shell to cut a hole in
 //   thickness = thickness of cylindrical shell (may need to be slighly oversized)