add comments

scripts/upgrade

@@ -159,6 +159,7 @@ datadir="/home/yunohost.app/${app}/data"
 
 # Set write access for the following commands
 chown -R $app: "$final_path" 
+# Change of owner and group if files in datadir does not have the right permissions
 find ${datadir}/ \! -user $app -o \! -group $app -exec chown $app: {} \;
 
 # Print the current version number of nextcloud
@@ -215,6 +216,7 @@ do
 
     # Set write access for the following commands
     chown -R $app: "$final_path" 
+    # Change of owner and group if files in datadir does not have the right permissions
     find ${datadir}/ \! -user $app -o \! -group $app -exec chown $app: {} \;
 
     # Upgrade Nextcloud (SUCCESS = 0, UP_TO_DATE = 3)
@@ -332,10 +334,13 @@ ynh_multimedia_addaccess $app
 
 # Fix app ownerships & permissions
 chown -R $app: "$final_path" 
+# Change of owner and group if files in datadir does not have the right permissions
 find ${datadir}/ \! -user $app -o \! -group $app -exec chown $app: {} \;
 find ${final_path}/ -type f -print0 | xargs -0 chmod 0644
 find ${final_path}/ -type d -print0 | xargs -0 chmod 0755
+# Change permissions if the file in datadir does not have the right permissions
 find ${datadir}/ -type f \! -perm 0640 -print0 | xargs -0 chmod 0640
+# Change permissions if directories in datadir does not have the right permissions
 find ${datadir}/ -type d \! -perm 0750 -print0 | xargs -0 chmod 0750
 chmod 640 "${final_path}/config/config.php"
 chmod 755 /home/yunohost.app