Spelling fixes in comments and descriptions, patch by luzpaz.

CMakeLists.txt

doc/blender_file_format/BlendFileDnaExporter_25.py

doc/blender_file_format/README

doc/blender_file_format/mystery_of_the_blend.html

doc/guides/blender-guardedalloc.txt

doc/guides/interface_API.txt

doc/python_api/examples/mathutils.Color.py

doc/python_api/examples/mathutils.Quaternion.py

doc/python_api/rst/bgl.rst

doc/python_api/rst/info_gotcha.rst

doc/python_api/rst/info_tips_and_tricks.rst

doc/python_api/rst_from_bmesh_opdefines.py

doc/python_api/sphinx_changelog_gen.py

doc/python_api/sphinx_doc_gen.py

doc/python_api/sphinx_doc_gen.sh

release/scripts/freestyle/modules/freestyle/shaders.py

release/scripts/modules/addon_utils.py

release/scripts/modules/animsys_refactor.py

release/scripts/modules/bl_i18n_utils/bl_extract_messages.py

release/scripts/modules/bl_i18n_utils/settings.py