try adding an "extended explanation" to compat bounds #1163

Job	Run time
Doctests	1m 58s
Documentation	2m 1s
Unit/Julia 1.3/ubuntu-latest/x64	8m 21s
Unit/Julia 1.4/ubuntu-latest/x64	9m 1s
Unit/Julia 1.5/ubuntu-latest/x64	7m 39s
Unit/Julia 1.6/ubuntu-latest/x64	5m 30s
Unit/Julia 1.7/ubuntu-latest/x64	5m 58s
Unit/Julia 1.8/ubuntu-latest/x64	5m 18s
Unit/Julia 1/ubuntu-latest/x64	4m 52s
Unit/Julia nightly/ubuntu-latest/x64	1m 29s
	52m 7s

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