docs: use foot in the example config.sh

contrib/config.sh

@@ -3,8 +3,8 @@
 # Use the "logo" key as the primary modifier
 mod="Mod4"
 
-# Mod+Shift+Return to start an instance of alacritty
-riverctl map normal $mod+Shift Return spawn alacritty
+# Mod+Shift+Return to start an instance of foot (https://codeberg.org/dnkl/foot)
+riverctl map normal $mod+Shift Return spawn foot
 
 # Mod+Q to close the focused view
 riverctl map normal $mod Q close

river/command/map.zig

@@ -43,7 +43,7 @@ const modifier_names = [_]struct {
 /// Create a new mapping for a given mode
 ///
 /// Example:
-/// map normal Mod4+Shift Return spawn alacritty
+/// map normal Mod4+Shift Return spawn foot
 pub fn map(
     allocator: *std.mem.Allocator,
     seat: *Seat,