Rollup merge of #65633 - Rantanen:doc-example-paths, r=Centril

Remove leading :: from paths in doc examples

Noted some pre-2018 path syntax in the doc examples, for example:
https://doc.rust-lang.org/std/process/fn.exit.html

```rust
fn main() {
    ::std::process::exit(match run_app() {
       Ok(_) => 0,
       ...
```

Couldn't find an existing issue on this (then again, "::" makes for an annoying thing to search for) so if there is already something fixing this and/or there's a reason to not fix it, just close this PR.

(Also fixed indentation in the `process::exit()` docs)

0 files changed, 0 insertions, 0 deletions