Make the link to the general documentation more visible

Author: IvanUkhov

README.md

@@ -2,16 +2,16 @@
 
 The package provides bindings to [BLAS] (Fortran).
 
-The usage of the package is explained [here][usage].
+## [Architecture]
 
 ## Contribution
 
 Your contribution is highly appreciated. Do not hesitate to open an issue or a
 pull request. Note that any contribution submitted for inclusion in the project
 will be licensed according to the terms given in [LICENSE.md](LICENSE.md).
 
+[architecture]: https://blas-lapack-rs.github.io/architecture
 [blas]: https://en.wikipedia.org/wiki/BLAS
-[usage]: https://blas-lapack-rs.github.io/usage
 
 [build-img]: https://travis-ci.org/blas-lapack-rs/blas-sys.svg?branch=master
 [build-url]: https://travis-ci.org/blas-lapack-rs/blas-sys

src/lib.rs

@@ -1,9 +1,9 @@
 //! Bindings to [BLAS] \(Fortran).
 //!
-//! The usage of the package is explained [here][usage].
+//! ## [Architecture]
 //!
+//! [architecture]: https://blas-lapack-rs.github.io/architecture
 //! [blas]: https://en.wikipedia.org/wiki/BLAS
-//! [usage]: https://blas-lapack-rs.github.io/usage
 
 #![no_std]