Added missing docs to face card bool functions

Author: Nydauron

src/core/card.rs

@@ -120,6 +120,11 @@ impl Value {
             Self::Ace => 41,
         }
     }
+
+    /// Returns true if the card value is of a face card (Jack, Queen, King)
+    pub fn is_face_card(&self) -> bool {
+        matches!(self, Self::Jack | Self::Queen | Self::King)
+    }
 }
 
 impl TryFrom<i32> for Value {
@@ -298,6 +303,11 @@ impl Card {
 
         bit_pattern
     }
+
+    /// Returns true if the card is a face card (Jack, Queen, King)
+    pub fn is_face_card(&self) -> bool {
+        self.value.is_face_card()
+    }
 }
 
 impl From<i32> for Card {