updated docs to use ... only when intended as code, and used midline ellipsis ⋯ when "etc." is intended. Also tried to make it clearer that the latter is not literal code, for example by converting "dims..." into "dims,⋯" which is less likely to be attempted as code by mistake. (Note that sometimes one might really mean to do "dims..." but that is usually not what the documentation intends to show.) Also used vertical ellipsis ⋮ to denote multiple lines of code. Sprinkled in "splat" to go with some cases of splice to make it easier to search, since splice is sometimes referred to in other contexts.