If `<arch>` starts with a capital ascii letter, it is an alias
for some other arch: it is looked up in the configuration, and
then in the builtin arch alias list. The builtin list is
- equivalent to: `[arch]` `RPI='arm-unknown-linux-gnueabihf'`.
+ equivalent to:
+
+ ```
+[arch]
+RPI="arm-unknown-linux-gnueabihf"
+ ```
* `-o` | `--online` | `-O` | `--offline`