move placement of std-dev-guide link (rust-lang#1699)

Author: zahash

src/getting-started.md

@@ -123,6 +123,10 @@ compiler. You can see a list of diagnostic issues [here][diagnostic-issues].
 
 [diagnostic-issues]: https://github.com/rust-lang/rust/issues?q=is%3Aissue+is%3Aopen+label%3AA-diagnostics+no%3Aassignee
 
+### Contributing to std (standard library)
+
+See [std-dev-guide](https://std-dev-guide.rust-lang.org/).
+
 ### Contributing code to other Rust projects
 
 There are a bunch of other projects that you can contribute to outside of the
@@ -171,10 +175,6 @@ incredibly helpful:
 
 See ["How to build and run the compiler"](./building/how-to-build-and-run.md).
 
-## How do i contribute to std?
-
-See [std-dev-guide](https://std-dev-guide.rust-lang.org/).
-
 ## Contributor Procedures
 
 This section has moved to the ["Contribution Procedures"](./contributing.md) chapter.