chore: fix docstrings

Author: wkrozowski

src/Std/Data/DTreeMap/Basic.lean

@@ -1050,6 +1050,7 @@ instance : Inter (DTreeMap α β cmp) := ⟨inter⟩
 
 /--
 Compares two tree maps using Boolean equality on keys and values.
+
 Returns `true` if the maps contain the same key-value pairs, `false` otherwise.
 -/
 def beq [LawfulEqCmp cmp] [∀ k, BEq (β k)] (t₁ t₂ : DTreeMap α β cmp) : Bool :=

src/Std/Data/TreeSet/Basic.lean

@@ -505,6 +505,7 @@ instance : Inter (TreeSet α cmp) := ⟨inter⟩
 
 /--
 Compares two tree sets using Boolean equality on keys.
+
 Returns `true` if the sets contain the same keys, `false` otherwise.
 -/
 def beq (t₁ t₂ : TreeSet α cmp) : Bool :=