Mostly fixes of typos in response to comments from arp

Thanks to arp!
http://stacks.math.columbia.edu/tag/09JM#comment-288
http://stacks.math.columbia.edu/tag/09JP#comment-289
http://stacks.math.columbia.edu/tag/014F#comment-290
http://stacks.math.columbia.edu/tag/08RI#comment-291
http://stacks.math.columbia.edu/tag/014H#comment-292
http://stacks.math.columbia.edu/tag/0642#comment-293
http://stacks.math.columbia.edu/tag/014I#comment-294
http://stacks.math.columbia.edu/tag/011L#comment-295
http://stacks.math.columbia.edu/tag/014L#comment-296
http://stacks.math.columbia.edu/tag/014M#comment-297
http://stacks.math.columbia.edu/tag/011G#comment-298