doc/manpages: fix qubes-create.1

The --property option went out in
83eef56f9dcf8115189a0e0d331d234f12ad1491.

doc/manpages/qubes-create.rst

@@ -26,10 +26,6 @@ Options
 
    Decrease verbosity.
 
-.. option:: --property=NAME=VALUE, --prop=NAME=VALUE, -p NAME=VALUE
-
-   On creation, set global property *NAME* to *VALUE*.
-
 Authors
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