Reformat TurboJPEG C API documentation to improve ease of maintenance and to make it more consistent with the javadoc formatting;  fix minor error in tjCompressFromYUV() prototype.

git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1344 632fc199-4ca6-4c93-a231-07263d6284db