Fix wrong label name and link

Author: 0xPoe

docs/CONTRIBUTING.md

@@ -11,16 +11,16 @@ everyone who wants to contribute to crates.io to participate.
 ## Finding an issue to work on
 
 We try to keep a variety of issues tagged with
-[E-mentor](https://github.com/rust-lang/crates.io/issues?q=is%3Aopen+is%3Aissue+label%3AE-mentor).
+[E-has-mentor](https://github.com/rust-lang/crates.io/issues?q=is%3Aopen+is%3Aissue+label%3AE-has-mentor).
 These issues should contain, somewhere within the body or the comments, clear
 instructions on what needs to be done and where the changes will need to be
-made. If any E-mentor issues do not contain this information or the information
+made. If any E-has-mentor issues do not contain this information or the information
 isn't clear, we consider this a bug, please comment and ask for clarification!
 Please don't hesitate to ask any questions on these issues, we're paying special
 attention to them and someone will get back to you with help as soon as
 possible.
 
-We'd also love contributions for issues not tagged E-mentor, they just might
+We'd also love contributions for issues not tagged E-has-mentor, they just might
 not be as well specified. You may want to browse through the labels that start
 with A-, which stands for "area", to find issues that match with your interests.