Add'l readability edits
Add'l readability edits

riibiax/thebookofshaders,MITI67/thebookofshaders,riibiax/thebookofshaders,riibiax/thebookofshaders,MITI67/thebookofshaders,MITI67/thebookofshaders,riibiax/thebookofshaders,MITI67/thebookofshaders,riibiax/thebookofshaders,riibiax/thebookofshaders,MITI67/thebookofshaders,MITI67/thebookofshaders