docs: keep the FAQ under its word ceiling

The --core answer added 14 words to a page held at 450. It now names the
command in as many words as the line it replaced, and the --region line
goes: what --region keeps is on the installer page.

wiki/faq.md

@@ -25,15 +25,13 @@ curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --dry-run
 
 ## Do I need every file of a console?
 
-No. `--core` keeps what your emulator reads, here PCSX for PlayStation:
+No. `--core pcsx1` keeps what PCSX reads:
 
 <!-- os-tabs -->
 ```sh
 curl -fsSL https://abdess.github.io/retrobios/i | sh -s -- --system sony-playstation --core pcsx1
 ```
 
-`--region us` drops another region's BIOS where a US one exists.
-
 ## Does the BIOS set the game's language?
 
 Rarely. It comes from the game. Some follow the console's setting, like Flycast's **Language**