docs: Fix events and props table generation

Mark Florianrequested to merge
fix-props-events-tables into master

In the upgrade to bootstrap-vue@2, the slot syntax for gl-tables changed. These usages in the documentation generator weren't updated, meaning that the events and props tables weren't displaying correctly. This MR fixes that.

Before After
props_before props_after
events_before events_after

/label frontend backstage devopssecure

Edited by Mark Florian

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