docs: keep two installer pages within budget

wiki/first-install.md

@@ -76,8 +76,7 @@ It shows your setup and its BIOS folder:
 ```
 
 - **Right folder?** Go on.
-- **Wrong folder?** Press Ctrl+C. Run the command again with your folder
-  after `--dest`:
+- **Wrong folder?** Press Ctrl+C. Run it again with your folder:
 
 <!-- os-tabs windows: --dest D:\path\to\bios -->
 ```sh
@@ -120,14 +119,12 @@ Add `--check` to the same command. It changes nothing.
 curl -fsSL https://raw.githubusercontent.com/Abdess/retrobios/main/install.sh | sh -s -- --check
 ```
 
-All good when every file is present and none is wrong:
+All good when every file is present:
 
 ```
   109/109 present (109 verified, 0 wrong hash)
 ```
 
-An empty folder also shows `0 wrong hash`, with `0/109 present`.
-
 ## Undo
 
 It keeps every file it replaces in a `retrobios-backup` folder, next to your
@@ -138,8 +135,7 @@ BIOS folder. The end of the run prints the line that puts them back.
 ### No supported platform detected.
 
 At a terminal, a menu follows. Pick your setup by its number, then type its
-BIOS folder, or press Enter for the usual one. A folder pasted with quotes
-around it is fine.
+BIOS folder, or press Enter for the usual one.
 
 With `--no-input`, or without a terminal, it stops and prints the command to
 use.

wiki/troubleshooting.md

@@ -66,9 +66,8 @@ version.
 
 ## If the command fails { #installation-script-fails }
 
-- **Network error:** try again once github.com opens.
-- **`The clock reads ...`:** the date is wrong. Let it sync over Wi-Fi, or set
-  it, then run again.
+- **Network error:** try again later.
+- **`The clock reads ...`:** set the right date.
 - **Permission denied:** do what the message says. It names what to run.
 - **No setup found:** name it and its folder: