bug#33025: Add examples of why one would want to "sort" something "randomly"

[Paul Eggert]

Thanks. Minor comments. The word "groupped" is a misspelling. Instead of " 
@samp{5},@samp{3},@samp{7} - exactly", write " 
@samp{5},@samp{3},@samp{7}--exactly"; that is, use an em dash rather than space, 
hyphen, space. Also, the style in .texi files is to put two spaces (or a 
newline) at the end of each sentence.