Remove incorrect comment and unused function

src/proc.rs

@@ -69,7 +69,6 @@ enum UnintentionalEntityState {
 }
 
 pub struct UnintentionalEntityPrevention {
-    // Start of ampersand if state is not Safe; otherwise simply the last `write_next` value of proc.
     last_write_next: usize,
     ampersand_pos: usize,
     state: UnintentionalEntityState,

src/unit/entity.rs

@@ -39,15 +39,6 @@ pub enum EntityType {
     Numeric(char),
 }
 
-impl EntityType {
-    pub fn is_malformed(&self) -> bool {
-        match self {
-            EntityType::Malformed(_) => true,
-            _ => false,
-        }
-    }
-}
-
 impl EntityType {
     pub fn keep(self, proc: &mut Processor) -> () {
         match self {