try adding an "extended explanation" to compat bounds #1162

Job	Run time
Doctests	2m 0s
Documentation	2m 35s
Unit/Julia 1.3/ubuntu-latest/x64	8m 17s
Unit/Julia 1.4/ubuntu-latest/x64	8m 45s
Unit/Julia 1.5/ubuntu-latest/x64	7m 49s
Unit/Julia 1.6/ubuntu-latest/x64	5m 17s
Unit/Julia 1.7/ubuntu-latest/x64	6m 0s
Unit/Julia 1.8/ubuntu-latest/x64	5m 19s
Unit/Julia 1/ubuntu-latest/x64	4m 55s
Unit/Julia nightly/ubuntu-latest/x64	1m 24s
	52m 21s

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