Update upgrade.md

Added "--" to options to reflect current syntax.
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Thilo Reich 2021-09-28 17:10:30 +01:00 committed by GitHub
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@ -24,10 +24,10 @@ Here are some example of corresponding command lines:
yunohost tools update
# Upgrade all system packages
yunohost tools upgrade system
yunohost tools upgrade --system
# Upgrade all apps
yunohost tools upgrade apps
yunohost tools upgrade --apps
# Upgrade a specific application
yunohost app upgrade wordpress