Spelling fixes in comments and descriptions, patch by luzpaz

add_curve_sapling/utils.py

add_mesh_BoltFactory/createMesh.py

animation_add_corrective_shape_key.py

archimesh/achm_roof_maker.py

archipack/archipack_gl.py

archipack/archipack_manipulator.py

blenderkit/__init__.py

blenderkit/append_link.py

blenderkit/download.py

blenderkit/paths.py

blenderkit/search.py

blenderkit/ui.py

blenderkit/upload.py

blenderkit/utils.py

io_anim_bvh/export_bvh.py

io_coat3D/tex.py

io_export_paper_model.py

io_mesh_atomic/utility_panel.py

io_scene_fbx/export_fbx_bin.py

io_scene_gltf2/blender/com/gltf2_blender_material_helpers.py