Assoc const equality doesn't work well with rustdoc

[compiler-errors]

Formatting asssociated const equality bounds was broken in #125076. This is because rustdoc uses:

rust/src/librustdoc/clean/types.rs

Line 1307 in 030a12c

EqPredicate { lhs: Type, rhs: Term },

Where the LHS is Type even though it definitely cannot be Type. It should likely be Term.