Document destroy method name inference

Update the developer guide to explicitly reference the (inferred)
constant introduced in 38e90105a0.

Also emphasis the fact that the (inferred) mode is enabled by default
with Java config and how to disable it if necessary.

Issue: SPR-12534
Polish documentation for inferred bean destruction mode
Ensure correct boxing in compiled code for OpEq with primitives

Without this change when the operands to an == are a mix of a
reference type and a primitive, the failure to box the primitive
would result in a verifyerror when the compiled code is loaded.

Issue: SPR-12557