[multimedia/kid3] doc/en: Quote filename in command-line example

[Karl Ove Hufthammer]

Git commit 7fd0ed877f0f393694c07165a8fc710add451081 by Karl Ove Hufthammer.
Committed on 07/06/2022 at 16:48.
Pushed by ufleisch into branch 'master'.

Quote filename in command-line example

The quotes are necessary for proper handling of filenames
that contain spaces.

M  +1    -1    doc/en/index.docbook

https://invent.kde.org/multimedia/kid3/commit/7fd0ed877f0f393694c07165a8fc710add451081

diff --git a/doc/en/index.docbook b/doc/en/index.docbook
index 786aabd6..6c94e9b0 100644
--- a/doc/en/index.docbook
+++ b/doc/en/index.docbook
@@ -2965,7 +2965,7 @@ Setting "ratingstars" on multiple files having different tag formats will not
 work because the frame with the value mapped from the star count is created
 for the first file and then used for all files. So instead of
 <userinput>kid3-cli -c "set ratingstars 2" *</userinput> you should rather use
-<userinput>for f in *; do kid3-cli -c "set ratingstars 2" $f; done</userinput>.
+<userinput>for f in *; do kid3-cli -c "set ratingstars 2" "$f"; done</userinput>.
 </para>
 </sect2>