Rollup merge of rust-lang#32622 - tyoc213:rust-beginners, r=alexcrichton

Book: in beginner guide change irc channel #rust → #rust-beginners

I also would like to add the reference on the first README.md

Some like

```
 most popular channel is [#rust], a venue for general discussion about
-Rust, and a good place to ask for help.
+Rust. And a good place to ask for help would be [#rust-beginners].

 [IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
 [#rust]: irc://irc.mozilla.org/rust
+[#rust-beginners]: irc://irc.mozilla.org/rust-beginners
```

So In the first page would be the two options for #rust or #rust-beginners

README.md

@@ -177,10 +177,11 @@ To contribute to Rust, please see [CONTRIBUTING](CONTRIBUTING.md).
 Rust has an [IRC] culture and most real-time collaboration happens in a
 variety of channels on Mozilla's IRC network, irc.mozilla.org. The
 most popular channel is [#rust], a venue for general discussion about
-Rust, and a good place to ask for help.
+Rust. And a good place to ask for help would be [#rust-beginners].
 
 [IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
 [#rust]: irc://irc.mozilla.org/rust
+[#rust-beginners]: irc://irc.mozilla.org/rust-beginners
 
 ## License
 

src/doc/book/getting-started.md

@@ -164,13 +164,15 @@ installed. Doing so will depend on your specific system, consult its
 documentation for more details.
 
 If not, there are a number of places where we can get help. The easiest is
-[the #rust IRC channel on irc.mozilla.org][irc], which we can access through
-[Mibbit][mibbit]. Click that link, and we'll be chatting with other Rustaceans
-(a silly nickname we call ourselves) who can help us out. Other great resources
-include [the user’s forum][users], and [Stack Overflow][stackoverflow].
+[the #rust-beginners IRC channel on irc.mozilla.org][irc-beginners] and for
+general discussion [the #rust IRC channel on irc.mozilla.org][irc], which we
+can access through [Mibbit][mibbit]. Then we'll be chatting with other
+Rustaceans (a silly nickname we call ourselves) who can help us out. Other great
+resources include [the user’s forum][users] and [Stack Overflow][stackoverflow].
 
+[irc-beginners]: irc://irc.mozilla.org/#rust-beginners
 [irc]: irc://irc.mozilla.org/#rust
-[mibbit]: http://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust
+[mibbit]: http://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-beginners,%23rust
 [users]: https://users.rust-lang.org/
 [stackoverflow]: http://stackoverflow.com/questions/tagged/rust