Auto merge of #12274 - jonas-schievink:move-getter-docs-generation, r=jonas-schievink

feat: Handle getters and setters in documentation template assist

The assist can now turn this:

```rust
pub struct S;
impl S {
    pub fn data_mut$0(&mut self) -> &mut [u8] { &mut [] }
}
```

into

```rust
pub struct S;
impl S {
    /// Returns a mutable reference to the data.
    ///
    /// # Examples
    ///
    /// ```
    /// use test::S;
    ///
    /// let mut s = ;
    /// assert_eq!(s.data_mut(), );
    /// assert_eq!(s, );
    /// ```
    pub fn data_mut(&mut self) -> &mut [u8] { &mut [] }
}
```

And similarly for by-value or immutable getters, and for setters. Previously the intro line would be empty.

This PR also removes the documentation generation function from the "Generate getter/setter" assist, since that is better handled by applying the 2 assists in sequence. cc https://github.com/rust-lang/rust-analyzer/issues/12273

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