Remove useless parenthesis.

src/list.cr

@@ -67,10 +67,10 @@ class DoubleLinkedList(V)
 	#
 	# ```
 	# list = DoubleLinkedList(Int32).new
-	# list.push(1)
-	# list.push(2)
-	# list.pop() # => 2
-	# list.pop() # => 1
+	# list.push 1
+	# list.push 2
+	# list.pop # => 2
+	# list.pop # => 1
 	# ```
 	def push(value : V) : Node(V)
 		# First entry is nil = pushing the first entry.
@@ -145,9 +145,9 @@ class DoubleLinkedList(V)
 	# list = DoubleLinkedList(Int32).new
 	# list << 1
 	# list << 2 << 3
-	# list.pop() # => 3
-	# list.pop() # => 2
-	# list.pop() # => 1
+	# list.pop # => 3
+	# list.pop # => 2
+	# list.pop # => 1
 	# ```
 	def <<(value : V) : DoubleLinkedList(V)
 		push(value)
@@ -159,8 +159,8 @@ class DoubleLinkedList(V)
 	# ```
 	# list = DoubleLinkedList(Int32).new
 	# list.push(1, 2)
-	# list.pop() # => 2
-	# list.pop() # => 1
+	# list.pop # => 2
+	# list.pop # => 1
 	# ```
 	def push(*values)
 		values.each do |value|
@@ -174,8 +174,8 @@ class DoubleLinkedList(V)
 	# list = DoubleLinkedList(Int32).new
 	# list << 1
 	# list.unshift 2
-	# list.pop() # => 1
-	# list.pop() # => 2
+	# list.pop # => 1
+	# list.pop # => 2
 	# ```
 	def unshift(value : V) : Node(V)
 		if first = @first
@@ -229,8 +229,8 @@ class DoubleLinkedList(V)
 	# list = DoubleLinkedList(Int32).new
 	# list << 1
 	# list << 2
-	# list.pop() # => 2
-	# list.peek() # => 1
+	# list.pop # => 2
+	# list.peek # => 1
 	# ```
 	def pop : Node(V)
 		if @size == 0
@@ -341,7 +341,7 @@ class DoubleLinkedList(V)
 	# ```
 	# list = DoubleLinkedList(Int32).new
 	# list.empty? # => true
-	# list.push(1)
+	# list << 1
 	# list.empty? # => false
 	# ```
 	def empty?
@@ -353,9 +353,9 @@ class DoubleLinkedList(V)
 	# ```
 	# list = DoubleLinkedList(Int32).new(1, 2, 3)
 	# reversed_list = list.reverse
-	# list.pop() # => 1
-	# list.pop() # => 2
-	# list.pop() # => 3
+	# list.pop # => 1
+	# list.pop # => 2
+	# list.pop # => 3
 	# ```
 	def reverse
 		DoubleLinkedList(V).new.tap do |new_list|
@@ -371,7 +371,7 @@ class DoubleLinkedList(V)
 	# values = [1, 2, 3]
 	# list = DoubleLinkedList(Int32).new(values)
 	# list.each_node do |elem|
-	#	 puts elem.value
+	#	puts elem.value
 	# end
 	# ```
 	private def each_node