Correct spelling

src/budget.rs

@@ -31,7 +31,7 @@ impl Condition {
     }
 }
 
-/// A data type reprsenting a payment plan.
+/// A data type representing a payment plan.
 #[repr(C)]
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub enum Budget {

src/payment_plan.rs

@@ -12,7 +12,7 @@ pub enum Witness {
     /// The current time.
     Timestamp(DateTime<Utc>),
 
-    /// A siganture from Pubkey.
+    /// A signature from Pubkey.
     Signature,
 }