Wrap rustdoc from PR 438 to 80 columns

Author: dtolnay

src/wrapper.rs

@@ -940,11 +940,12 @@ impl Debug for Literal {
 /// This function is useful for programs that process more than 2^32 bytes of
 /// text on a single thread. The internal representation of `proc_macro2::Span`
 /// uses 32-bit integers to represent offsets and those will overflow when
-/// processing more than 2^32 bytes. This function resets all offsets
-/// and thereby also invalidates any previously created `proc_macro2::Span`.
+/// processing more than 2^32 bytes. This function resets all offsets and
+/// thereby also invalidates any previously created `proc_macro2::Span`.
 ///
 /// This function requires the `span-locations` feature to be enabled. This
-/// function is not applicable to and will panic if called from a procedural macro.
+/// function is not applicable to and will panic if called from a procedural
+/// macro.
 #[cfg(span_locations)]
 pub fn invalidate_current_thread_spans() {
     if inside_proc_macro() {