[ITensors] Add prime indices for inner in documentation

[ryanlevy]

Description

inner(x,A,x) was deprecated but the docs aren't updated to show this. I added this to the docs and inner documentation page. I left out the Apply(A,x) option but can add that in if you want to mention it.

I should also note that inner(A,x,A,x) only works without primes at the moment (#696 )

Checklist:

• My code follows the style guidelines of this project. Please run using JuliaFormatter; format(".") in the base directory of the repository (~/.julia/dev/ITensors) to format your code according to our style guidelines.
• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.

[mtfishman]

Thanks! Too bad about the AD test failures, probably there was a regression in Zygote, which has been the case for previous AD test regressions (i.e. GTorlai/PastaQ.jl#300).

[emstoudenmire]

Thanks Ryan!