fix: keep the first steps under their ceiling

The record's page text took first-install.md 31 words over its 400. It now says only that one setup opens on Install. RETROBIOS_TUI_RECORDED is an internal marker of the full screen's own runs, like RETROBIOS_TUI_LIST.

tests/test_doc_pages.py

@@ -1697,7 +1697,7 @@ class InstallerVariablesAreDocumented(unittest.TestCase):
     --dry-run, and no page named it or the folder it defaults to."""
 
     # Set by the full-screen interface for the runs it starts, never by a user.
-    INTERNAL = {"RETROBIOS_TUI_LIST"}
+    INTERNAL = {"RETROBIOS_TUI_LIST", "RETROBIOS_TUI_RECORDED"}
 
     def test_every_variable_install_py_reads_is_in_the_table(self):
         source = (ROOT / "install.py").read_text(encoding="utf-8")

wiki/first-install.md

@@ -68,8 +68,7 @@ On Batocera, Recalbox and similar setups, see
 
 ## 2. Check the setup it found
 
-With one setup found, it opens on step 3, its folder on the second line.
-With none or several, it asks:
+With one setup, it opens on **Install**. Otherwise:
 
 ```
  RetroBIOS: Where to install?
@@ -81,8 +80,8 @@ With none or several, it asks:
 
 - **Right folder?** Press Enter.
 - **Wrong folder, or a handheld's SD card?** Choose
-  **Another setup or folder** (**Change where** from step 3).
-  Press / and type the device (Miyoo Mini), or browse.
+  **Another setup or folder**. Press / and type the device (Miyoo Mini),
+  or browse.
 
 Arrows move, Enter chooses, Esc goes back (A and B on a handheld). On a
 touch screen, tap a row twice to open it, once to tick a box.
@@ -90,9 +89,9 @@ touch screen, tap a row twice to open it, once to tick a box.
 ## 3. Install
 
 Press Enter on **Install**. **Choose systems** picks the consoles to
-keep. Run it again later: it keeps that choice, one press.
+keep.
 
-**Game data** (only a game reads it) has its own row.
+**Game data** has its own row.
 
 **Old card?** In a card reader, choose **Copy the BIOS files from an old
 card or a folder**, then the card.