docs(README): improve Homebrew references (#745)

Author: rouson

README.md

@@ -104,8 +104,8 @@ For more details check the package information [here](https://spack.readthedocs.
 
 #### Homebrew
 
-The Fortran Package Manager (fpm) is available for the [homebrew](https://brew.sh/) package manager on MacOS via an additional tap.
-To install fpm via brew, include the new tap and install it using
+The Fortran Package Manager (fpm) is available for the [Homebrew](https://brew.sh/) package manager via an additional tap.
+To install fpm via brew, include the new tap and install using
 
 ```
 brew tap fortran-lang/fortran