Fix docs dfg

crates/ir/src/dfg.rs

@@ -319,12 +319,12 @@ impl DataFlowGraph {
         self.insns[insn].is_branch()
     }
 
-    /// Returns `true` if `value` is an immediate.
+    /// Returns `true` if `value` resolves to an immediate.
     pub fn is_imm(&self, value: Value) -> bool {
         self.value_imm(value).is_some()
     }
 
-    /// Returns `true` if `value` is a function argument.
+    /// Returns `true` if `value` resolves to a function argument.
     pub fn is_arg(&self, value: Value) -> bool {
         matches!(self.value_data(value), ValueData::Arg { .. })
     }