Rollup merge of #62942 - KevinWMatthews:condvar_docs_match_ergo, r=sfackler
Rollup merge of #62942 - KevinWMatthews:condvar_docs_match_ergo, r=sfackler

Use match ergonomics in Condvar documentation

Documentation was written before match ergonomics was merged. See #62857.

In short, replaces

```rust
let &(ref lock, ref cvar) = &*pair;
```

with

```rust
let (lock, cvar) = &*pair
```

in the docs of `std::sync::Condvar`.

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust