Correct git filter-branch command line argument on PowerShell

Author: satob

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

@@ -52,7 +52,7 @@ The following command will do that:
 
 [source,powershell]
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-PS> git filter-branch -f --msg-filter 'sed "s/^git-tfs-id:.*$//g"' -- --all
+PS> git filter-branch -f --msg-filter 'sed "s/^git-tfs-id:.*$//g"' '--' --all
 ----
 
 That uses the `sed` command from the Git-bash environment to replace any line starting with ``git-tfs-id:'' with emptiness, which Git will then ignore.