doc: Mention the var-mixin-cleanup in upgrading notes

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Johannes Meyer 2022-02-08 12:38:50 +01:00
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@ -10,6 +10,7 @@ v2.6 to v2.8 requires to follow the instructions for v2.7 too.
* Asset support for modules (#3961) introduced with v2.8 has now been removed.
* `expandable-toggle`-support has been removed. Use `class="collapsible" data-visible-height=0`
to achieve the same effect. (Available since v2.7.0)
* The `.var()` LESS mixin and the LESS function `extract-variable-default` have been removed (introduced with v2.9)
## Upgrading to Icinga Web 2 2.9.1