draft tutorial revisions

docs/cookbook/grid/grid_cell_highlighting_multi.py

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+"""McRogueFace - Cell Highlighting (Targeting) (multi)
+
+Documentation: https://mcrogueface.github.io/cookbook/grid_cell_highlighting
+Repository: https://github.com/jmccardle/McRogueFace/blob/master/docs/cookbook/grid/grid_cell_highlighting_multi.py
+
+This code is extracted from the McRogueFace documentation and can be
+run directly with: ./mcrogueface path/to/this/file.py
+"""
+
+def show_path_preview(start, end):
+    """Highlight the path between two points."""
+    path = find_path(start, end)  # Your pathfinding function
+
+    if path:
+        highlights.add('path', path)
+
+        # Highlight destination specially
+        highlights.add('select', [end])
+
+def hide_path_preview():
+    """Clear path display."""
+    highlights.remove('path')
+    highlights.remove('select')