Remove Trailing Whitespace from the Spec

[akutz]

This patch removes trailing whitespace from the CSI specification.

[gpaul]

This is great. Do consider adding a 'strip whitespace' command to the Makefile build target and enforce the check in CI - otherwise it is just a matter of time until some nano user adds spaces again.

[akutz]

Hi @gpaul,

Good call. I know most of it was added by @jdef when he authored the documents, but I also know he uses Vim on, presumably, Linux. My attempts to edit them with Vim on macOS also strip the whitespace. It's when I surmised it was some default behavior based on OS/editor combination.

I'm not sure if you and @jdef accidentally type a trailing space before you go to a newline or if the OS/editor defaults to doing it automatically. I know I often default to leaving spaces before I hit return, and my editor just simply erases them for me.

I am also very picky about details and as a result my editor shows whitespace characters so it is obvious to me when I use spaces instead of tabs by pasting in some text, or when there is trailing whitespace at the end of a line or on an otherwise "empty" line.

Again though, it's not an Atom thing alone as vim on macOS also strips all these spaces. It's weird.

[jieyu]

Thanks @akutz !