I think it would be easier find and much more search engine friendly. I know until the answer was provide the tag would have made any sense. But now that it has can it be tagged such. I'm assuming answers do have an affect on the question.
tail isn't just about the
tail(1) utility, but generally about keeping a file open and watching data that is appended to it — an activity which is often described in reference to
tail -f (as witness the names of utilities which extend
tail -f, such as multitail, colortail, inotail, …).
I've written a tag wiki for tail. I emphasize the tailing (follow mode) aspect — I'm not convinced we need head and tail tags for the
tail utilities, as they're fairly specialized and only invite a small number of text-processing questions.
If tail should exist, then it should be.
But that's not really to make it more searchable, it's to bring it to the attention of the
tail experts. (That sounds silly, which argues tail is silly, but let's ignore that.) It's really not useful for searching, because if you already know to use tail, you already know the answer. May be useful for finding duplicates, but again that's really for the expert(s) to decide.
The rant now done, there is the issue of the edit queue. When something goes through the edit queue, it requires the time of two high-rep users, three if they disagree. That's the valuable thing that the "too minor" rule is to protect, not really the 2 rep.
What we'd like most is if, in addition to retagging, you'd fix the other problems with the post. You'll get two rep and progress towards several badges, and most importantly make the Internet a (slightly) better place.
Another good option is of course to write enough good questions and answers to be able to edit without going through the review queue. Then you can make all the minor edits you'd like.
Finally, you could just ignore it.
When I ask a question on a StackExchange site where I don't have a lot of experience, I always find it complicated to use appropriate tags. With this kind of questions on this site, you can expect that there is some tool that can help you. Only, how are you going to tag it properly if you don't know which tool to use? I would say that it makes perfectly sense to update the question-tags accordingly.