Rollup merge of #124746 - OliverKillane:E0582-explain-assoc-types-improvement, r=pnkfelix

`rustc --explain E0582` additional example

## Context
*From #124744*

Expands the example for E0582, an error ensuring that lifetime in a function's return type is sufficiently constrained (e.g. actually tied to some input type), to show an additional example where one sees the lifetime occurring syntactically among the relevant function input types, but is nonetheless rejected by rustc because a syntactic occurrence is not always sufficient.

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