[Ada] GNAT.Debug_Pools: Improve documentation of the Stack_Trace_Depth parameter
Setting this parameter to zero when calling the Configure procedure has
the effect of disabling completely the tracking of the biggest memory
users, which wasn't clear from the current documentation. So this patch
enhances the documentation of both the Configure procedure as well as
the Dump procedure to make that explicit.
gcc/ada/
* libgnat/g-debpoo.ads: Improve documentation of the
Stack_Trace_Depth parameter.