Rollup merge of rust-lang#80431 - xfix:add-chr-as-doc-alias, r=steveklabnik

Add "chr" as doc alias to char::from_u32

Many programming languages provide a function called `chr` - Perl, Python, PHP, Visual Basic, SQL. This change makes `char::from_u32` easier to discover in the documentation.

`ord` is not added as its name conflicts with `Ord` trait, and it's not exactly clear what it could point to (`<u32 as From<char>>::from`?). I don't think it's exactly necessary, as `char::from_u32` documentation page says you can do reverse conversion with `as` operator anyway.

Author: m-ou-se

library/core/src/char/convert.rs

@@ -47,6 +47,7 @@ use super::MAX;
 ///
 /// assert_eq!(None, c);
 /// ```
+#[doc(alias = "chr")]
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub fn from_u32(i: u32) -> Option<char> {