Add line breaks correctly.

Signed-off-by: Archer <naarcha@amazon.com>

Author: Naarcha-AWS

spec-insert/lib/renderers/table_renderer.rb

@@ -28,7 +28,7 @@ def initialize(columns, rows, pretty:)
   # @return [Array<String>]
   def render_lines
     calculate_column_widths if @pretty
-    [render_column, render_divider] + render_rows
+    ["\n", render_column, render_divider] + render_rows + ["\n"] + render_rows
   end
 
   private

spec-insert/lib/renderers/templates/spec_insert.mustache

@@ -3,7 +3,5 @@
 {{{key}}}: {{{value}}}
 {{/arguments}}
 -->
-
 {{{content}}}
-
 <!-- spec_insert_end -->