Rollup merge of #88735 - hnj2:patch-1, r=GuillaumeGomez

Don't lint about missing code examples in derived traits

When the `missing_doc_code_examples` lint is performed it also requires that derived Trait implementations have a code example for each member etc., which causes undesirable behavior.

# Examples

With `missing_doc_code_examples` enable we are not able to use the `Clone` derive macro due to the generated code not being documented:
```rust
#[deny(rustdoc::missing_doc_code_examples)]

/// docs
/// ```
/// let s = SomeStruct;
/// ```
#[derive(Clone)]
pub struct SomeStruct;
```
yields:
```
 Documenting testt v0.1.0 (<redacted>)
error: missing code example in this documentation
 --> src/lib.rs:7:10
  |
7 | #[derive(Clone)]
  |          ^^^^^
  |
note: the lint level is defined here
 --> src/lib.rs:1:8
  |
1 | #[deny(rustdoc::missing_doc_code_examples)]
  |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: missing code example in this documentation
 --> src/lib.rs:7:10
  |
7 | #[derive(Clone)]
  |          ^^^^^

error: could not document `testt`

Caused by:
  process didn't exit successfully: `rustdoc ...
```

closes #81775

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