Remove unnecessary whitespace from import-custom.asc and add missing colons

Author: crd

book/09-git-and-other-scms/sections/import-custom.asc

@@ -79,14 +79,14 @@ end
 
 Now that you have an integer representation of your commit, you need a date for the commit metadata.
 Because the date is expressed in the name of the directory, you'll parse it out.
-The next line in your `print_export` file is
+The next line in your `print_export` file is:
 
 [source,ruby]
 ----
 date = convert_dir_to_date(dir)
 ----
 
-where `convert_dir_to_date` is defined as
+where `convert_dir_to_date` is defined as:
 
 [source,ruby]
 ----
@@ -220,7 +220,6 @@ def convert_dir_to_mark(dir)
     ($marks.index(dir)+1).to_s
 end
 
-
 def convert_dir_to_date(dir)
     if dir == 'current'
         return Time.now().to_i
@@ -259,7 +258,6 @@ def print_export(dir, last_mark)
     mark
 end
 
-
 # Loop through the directories
 last_mark = nil
 Dir.chdir(ARGV[0]) do