don't reference homebrew specifically

Author: jpsim

Documentation/SystemModules.md

@@ -29,7 +29,7 @@ The following files from the JPEG system-package are of interest:
 
 Swift packages that provide module maps for system libraries are handled differently from regular Swift packages.
 
-Note that `brew` will install this package in `/usr/local/` rather than `/usr/`.
+Note that this package may be located elsewhere on your system, such as `/usr/local/` rather than `/usr/`.
 
 Create a directory called `CJPEG` parallel to the `example` directory and create a file called `module.modulemap`: