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In the XSLT Source Editor, when an option on the code completion suggestions list is selected, an associated Documentation pane should appear (according to the code completion wiki page). Currently, it appears that no documentation panes are appearing for any of the selected options.
Now documentation info, related to XSLT tags/attributes/attribute values, is not available because implementation of XSLT code completion is not based on XSLT document schema (XSLT 1.0 and 2.0). So, a documentation box will not be displayed or will not contain any info.
I prefer to make this issue as an enhancement.