[w3c/FileAPI] Document BlobPropertyBag "endings", or keep pushing to remove? (#46)

https://jsfiddle.net/422r7n3z/ - exercises `new Blob([s], {endings:e}).size`

On Windows, in Chrome/Firefox:
transparent + "abc\r\n" = 5
transparent + "abc\n" = 4
transparent + "abc\r" = 4
native + "abc\r\n" = 5
native + "abc\n" = 5
native + "abc\r" = 5

On Windows, in IE11:
transparent + "abc\r\n" = 5
transparent + "abc\n" = 4
transparent + "abc\r" = 4
native + "abc\r\n" = 5
native + "abc\n" = 4
native + "abc\r" = 4

On OSX and Linux, in Chrome/Firefox/Safari:
transparent + "abc\r\n" = 5
transparent + "abc\n" = 4
transparent + "abc\r" = 4
native + "abc\r\n" = 4
native + "abc\n" = 4
native + "abc\r" = 4

(I have not tested Opera or Edge; I assume those match Chrome and IE11)

Note that all 4 browsers - _including IE which does not appear to respect the option otherwise_ - throw if an invalid option is passed as `endings`. 

I gathered usage stats in Chrome stable: https://www.chromestatus.com/metrics/feature/timeline/popularity/1320 - it's 0% to several significant figures (people running web-platform-tests would account for the absolute #s).

Should we proceed with removing, or does anyone want to advocate for keeping it? @smaug----, @foolip, @aliams, .... ?


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