options1: Update wording & fix grammar

Signed-off-by: Dan Bond <danbond@protonmail.com>

Author: loshz

exercises/12_options/options1.rs

@@ -6,11 +6,11 @@
 // I AM NOT DONE
 
 // This function returns how much icecream there is left in the fridge.
-// If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them
+// If it's before 10PM, there's 5 scoops left. At 10PM, someone eats it
 // all, so there'll be no more left :(
 fn maybe_icecream(time_of_day: u16) -> Option<u16> {
     // We use the 24-hour system here, so 10PM is a value of 22 and 12AM is a
-    // value of 0 The Option output should gracefully handle cases where
+    // value of 0. The Option output should gracefully handle cases where
     // time_of_day > 23.
     // TODO: Complete the function body - remember to return an Option!
     ???
@@ -22,10 +22,11 @@ mod tests {
 
     #[test]
     fn check_icecream() {
+        assert_eq!(maybe_icecream(0), Some(5));
         assert_eq!(maybe_icecream(9), Some(5));
-        assert_eq!(maybe_icecream(10), Some(5));
-        assert_eq!(maybe_icecream(23), Some(0));
+        assert_eq!(maybe_icecream(18), Some(5));
         assert_eq!(maybe_icecream(22), Some(0));
+        assert_eq!(maybe_icecream(23), Some(0));
         assert_eq!(maybe_icecream(25), None);
     }