chore: fix name "Set.cou_inter_self_right_eq_coe" (#18222)

The old name contained a typo. The new one is symmetric to the name of the following lemma in the same file.

Author: sven-manthe

Mathlib/Data/Set/Subset.lean

@@ -112,8 +112,10 @@ lemma image_val_union_self_left_eq : ↑D ∪ A = A :=
   union_eq_right.2 image_val_subset
 
 @[simp]
-lemma cou_inter_self_right_eq_coe : A ∩ ↑D = ↑D :=
+lemma image_val_inter_self_right_eq_coe : A ∩ ↑D = ↑D :=
   inter_eq_right.2 image_val_subset
+@[deprecated (since := "2024-10-25")]
+alias cou_inter_self_right_eq_coe := image_val_inter_self_right_eq_coe
 
 @[simp]
 lemma image_val_inter_self_left_eq_coe : ↑D ∩ A = ↑D :=