Update note about --no-metadata

Updated the note due to the argumentation of
#555 (comment)

So the comment is less radical and fits better into the context of a
migration from svn to git.

Author: nemoinho

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

@@ -31,8 +31,7 @@ That generates the log output in XML format, then keeps only the lines with auth
 Then, redirect that output into your `users.txt` file so you can add the equivalent Git user data next to each entry.
 
 You can provide this file to `git svn` to help it map the author data more accurately.
-You can also tell `git svn` not to include the metadata that Subversion normally imports, by passing `--no-metadata` to the `clone` or `init` command.
-However this is not recommended because it breaks the two-way synchronisation between the git repository and the svn repository.
+You can also tell `git svn` not to include the metadata that Subversion normally imports, by passing `--no-metadata` to the `clone` or `init` command (though if you want to keep the synchronisation-metadata, feel free to omit this parameter).
 This makes your `import` command look like this:
 
 [source,console]