Auto merge of #64972 - Centril:rollup-gcawast, r=Centril

Rollup of 7 pull requests

Successful merges:

 - #63416 (apfloat: improve doc comments)
 - #64820 (BTreeSet intersection, is_subset & difference optimizations)
 - #64910 (syntax: cleanup param, method, and misc parsing)
 - #64912 (Remove unneeded `fn main` blocks from docs)
 - #64933 (Fixes #64919. Suggest fix based on operator precendence.)
 - #64943 (Add lower bound doctests for `saturating_{add,sub}` signed ints)
 - #64950 (Simplify interners)

Failed merges:

r? @ghost

1 files changed, 2 insertions, 4 deletions

diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index abe50fdb7a3..639124e26cc 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -164,10 +164,8 @@ use crate::vec::Vec;
 ///
 /// fn example_func<A: TraitExample>(example_arg: A) {}
 ///
-/// fn main() {
-///     let example_string = String::from("example_string");
-///     example_func(&example_string);
-/// }
+/// let example_string = String::from("example_string");
+/// example_func(&example_string);
 /// ```
 ///
 /// There are two options that would work instead. The first would be to