Remove redundant empty comment lines

src/ameba/config.cr

@@ -111,7 +111,6 @@ class Ameba::Config
   # config.formatter = custom_formatter
   # config.formatter
   # ```
-  #
   property formatter : Formatter::BaseFormatter do
     Formatter::DotFormatter.new
   end

src/ameba/source.cr

@@ -46,7 +46,6 @@ module Ameba
     # source = Ameba::Source.new "a = 1\nb = 2", path
     # source.lines # => ["a = 1", "b = 2"]
     # ```
-    #
     getter lines : Array(String) { code.split('\n') }
 
     # Returns AST nodes constructed by `Crystal::Parser`.
@@ -55,7 +54,6 @@ module Ameba
     # source = Ameba::Source.new code, path
     # source.ast
     # ```
-    #
     getter ast : Crystal::ASTNode do
       Crystal::Parser.new(code)
         .tap(&.wants_doc = true)