options: update monitor option text (#291)

## Link to GitHub Issue, if one exists
n/a

## Description of change
Update tooltip for `-monitor` option. Move to `Graphics (Full Screen)`
to reduce clutter.

## Compilin
👍 

## Testing
n/a

src/spice2x/launcher/options.cpp

@@ -186,9 +186,12 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
     {
         .title = "Monitor",
         .name = "monitor",
-        .desc = "Sets the display that the game will be opened in, for multiple monitors",
+        .desc = "Sets the display that the game will be opened in, for multiple monitors.\n\n"
+            "0 is the primary monitor, 1 is the second monitor, and so on.\n\n"
+            "Not all games will respect this. Does not work at all with multi-monitor games like TDJ/UFC. "
+            "Disable Full Screen Optimizations for best results",
         .type = OptionType::Integer,
-        .category = "Graphics (Common)",
+        .category = "Graphics (Full Screen)",
     },
     {
         .title = "Only Use One Monitor",