CompatHelper: bump compat for AdvancedVI to 0.6 for package docs, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the AdvancedVI package from 0.7 to 0.7, 0.6 for package docs.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[github-actions]

AdvancedVI.jl documentation for PR #222 is available at:
https://TuringLang.github.io/AdvancedVI.jl/previews/PR222/

[github-actions]

Benchmark Results

Benchmark suite	Current: 1ac865e	Previous: bc7da8e	Ratio
normal/RepGradELBO + STL/meanfield/Zygote	2610971084 ns	2236328131 ns	1.17
normal/RepGradELBO + STL/meanfield/ReverseDiff	611674167 ns	584926592 ns	1.05
normal/RepGradELBO + STL/meanfield/Mooncake	238980278 ns	190368913 ns	1.26
normal/RepGradELBO + STL/fullrank/Zygote	1994641149 ns	1674815989 ns	1.19
normal/RepGradELBO + STL/fullrank/ReverseDiff	1168553759 ns	1109764173 ns	1.05
normal/RepGradELBO + STL/fullrank/Mooncake	649234694.5 ns	480416315 ns	1.35
normal/RepGradELBO/meanfield/Zygote	1562940369 ns	1243443795 ns	1.26
normal/RepGradELBO/meanfield/ReverseDiff	303834860 ns	283741496.5 ns	1.07
normal/RepGradELBO/meanfield/Mooncake	166682762 ns	140268590 ns	1.19
normal/RepGradELBO/fullrank/Zygote	1057172586 ns	809191706 ns	1.31
normal/RepGradELBO/fullrank/ReverseDiff	594903823 ns	530633461 ns	1.12
normal/RepGradELBO/fullrank/Mooncake	536223117 ns	401513807 ns	1.34

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