Technically it's not missing, it's the way how it was created, as you can see text property and its description comes from here https://github.com/xwiki/xwiki-platform/blob/fbcc1a800c321afe6ff9eb4fa9828f933ad0659d/xwiki-platform-core/xwiki-platform-display/xwiki-platform-display-macro/src/main/java/org/xwiki/rendering/macro/display/DisplayMacroParameters.java#L130-L131
