doc: make node(1) more consistent with tradition

* Added traditional BUGS, AUTHORS and COPYRIGHT sections
* Fixed some minor issues with the IRC links

PR-URL: #8902
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/node.1

@@ -159,8 +159,26 @@ is ~/.node_repl_history, which is overridden by this variable. Setting the
 value to an empty string ("" or " ") disables persistent REPL history.
 
 
-.SH RESOURCES AND DOCUMENTATION
+.SH BUGS
+Bugs are tracked in GitHub Issues:
+.ur https://github.com/nodejs/node/issues
+
+
+.SH AUTHORS
+Written and maintained by 1000+ contributors:
+.ur https://github.com/nodejs/node/blob/master/AUTHORS
+
 
+.SH COPYRIGHT
+Copyright Node.js contributors. Node.js is available under the MIT license.
+
+Node.js also includes external libraries that are available under a variety
+of licenses. See
+.ur https://github.com/nodejs/node/blob/master/LICENSE
+for the full license text.
+
+
+.SH RESOURCES AND DOCUMENTATION
 Website:
 .ur https://nodejs.org/
 
@@ -175,6 +193,7 @@ Mailing list:
 
 IRC (general questions):
 .ur "chat.freenode.net #node.js"
+(unofficial)
 
-IRC (node core development):
+IRC (Node.js core development):
 .ur "chat.freenode.net #node-dev"