Add missing colons to import-svn.asc

Author: crd

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

@@ -72,7 +72,7 @@ You should also do a bit of post-import cleanup.
 For one thing, you should clean up the weird references that `git svn` set up.
 First you'll move the tags so they're actual tags rather than strange remote branches, and then you'll move the rest of the branches so they're local.
 
-To move the tags to be proper Git tags, run
+To move the tags to be proper Git tags, run:
 
 [source,console]
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