Yeah, yeah, technically the rejection notice states “this edit plagiarizes content from an external source without proper attribution”, whereas your edits did provide attribution. However, your edits were not appropriate because they did not respect the license of the content you copied, hence the heading “copied content” did apply. All content on Stack Exchange is licensed under a Creative Commons license. When you contribute content, you agree to the terms of service which state that you warrant that your contributed content can be distributed under the CC license. The content of the man pages that you contributed is under a copyleft license, which allows copying, but not under CC terms, only under other terms which you did not respect.
The legal situation with your suggested edits was not their only problem. You were also pointed to the tag wiki guidelines. Please read those guidelines before suggesting tag wikis. Also, please apply common sense.
As you can see when you browse tag wiki excerpts, there is no formatting in excerpts. This excerpt (which unfortunately was accepted — I went and replaced it by something sensible) is unreadable:
bind(2) - bind a name to a socket. #include <sys/types.h> #include <sys/socket.h> int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen);”.
In addition, this excerpt has useless content — which headers to include does not belong in an excerpt. And on the other hand it lacks important information: there's no context. This excerpt would need to state that this
bind thing is a function in the Unix networking API.
The corresponding tag wiki has a lot of problems as well. You just copied the manual page, without bothering to adapt the formatting. There are external references, which you didn't convert to links. There are parts that should have been formatted as code or as titles, you didn't do that.
Furthermore, most of the content of the man page is irrelevant here. The detailed description, the list of error values, the code examples are too much detail. You should have linked to the man page, not copied. In fact the only things that could be retained are the one-line description (which however needs more context) and the prototype.
In addition to a description that's actually comprehensible, you should have included links to the official documentation — here, the Linux man page but also documentation of other systems such as the FreeBSD man page and the POSIX specification would have been appropriate. You should also have provided guidance on when to use the tag (only if the question is about the
bind function — or rather, that's what you should have said if that had been the meaning of the tag).
On top of this, your proposed tag wiki only addressed part of the meaning of the tag. It's important when you write a tag wiki to provide at least an overview that discusses the meaning of the tag in general. None of the tags you proposed wikis for (accept, bind, listen, send, sockets) are specific to Linux network programming. For one thing, the networking functions are available in other languages and on other platforms. Worse, some of these tags have multiple meanings, and you only addressed one of these. It was particularly bad for bind (which gets more use as a jQuery method) and send (which is used for all kinds of message sending interfaces, not just in Linux network programming).
To summarize, your suggested content was illegal, badly formatted, unhelpful and incomplete. That's on top of your contribution being a zero-effort copy-paste job. These were not beneficial in any way. Please make contributions that are legal, readable, with useful content. You'll see that if you do that, your contributions will be well-received.