fix: correct typo

Author: AtomHare

lang/english.txt

@@ -1125,7 +1125,7 @@ GUI_SGASETACTION="Artwork Set Method"
 DESC_SGASETACTION="Specifies how to set the artwork, either by copying the source files, symlinking them, or moving them - If unsure, leave at default 'copy'"
 GUI_STLRAD_PFTST="RADV Perfest options"
 DESC_STLRAD_PFTST="A comma-separated list of named flags, which can be used to enable experimental driver features and performance enhancements for RADV Vulkan driver"
-GUI_STEAMDECK_AUTOUP="Autoupdate STL libraries [SteamDeck ONLY]"
+GUI_STEAMDECK_AUTOUP="Autoupdate STL libraries [Steam Deck ONLY]"
 DESC_STEAMDECK_AUTOUP="Enable the libraries autoupdater for the Steam Deck after an STL update"
 GUI_MAHUDLSYM="Use MangoHud --dlsym"
 DESC_MAHUDLSYM="Append '--dlsym' to MangoHud - May fix OpenGL games not displaying MangoHud"