Adjust parentheses after << method name.

lib/protocol/http/body/stream.rb

@@ -315,7 +315,7 @@ def write_nonblock(buffer, exception: nil)
 				end
 
 				# Write data to the stream using {write}.
-				def <<(buffer)
+				def << buffer
 					write(buffer)
 				end
 

lib/protocol/http/header/accept.rb

@@ -81,7 +81,7 @@ def initialize(value = nil)
 				# The input string is split into distinct entries and appended to the array.
 				#
 				# @parameter value [String] the value or values to add, separated by commas.
-				def << (value)
+				def << value
 					self.concat(value.scan(SEPARATOR).map(&:strip))
 				end