auto merge of #14357 : huonw/rust/spelling, r=pnkfelix

The span on a inner doc-comment would point to the next token, e.g. the span for the `a` line points to the `b` line, and the span of `b` points to the `fn`.

```rust
//! a
//! b

fn bar() {}
```

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index cc965bc6eed..b44b6919cd9 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -76,7 +76,7 @@ pub trait FormatWriter {
     /// This function will return an instance of `FormatError` on error.
     fn write(&mut self, bytes: &[u8]) -> Result;
 
-    /// Glue for usage of the `write!` macro with implementors of this trait.
+    /// Glue for usage of the `write!` macro with implementers of this trait.
     ///
     /// This method should generally not be invoked manually, but rather through
     /// the `write!` macro itself.