Auto merge of #72794 - RalfJung:rollup-gzs4nl4, r=RalfJung

Rollup of 13 pull requests

Successful merges:

 - #72543 (Account for missing lifetime in opaque and trait object return types)
 - #72625 (Improve inline asm error diagnostics)
 - #72637 (expand `env!` with def-site context)
 - #72650 (Sort sidebar elements)
 - #72657 (Allow types (with lifetimes/generics) in impl_lint_pass)
 - #72666 (Add -Z profile-emit=<path> for Gcov gcda output.)
 - #72668 (Fix missing parentheses Fn notation error)
 - #72669 (rustc_session: Cleanup session creation)
 - #72728 (Make bootstrap aware of relative libdir in stage0 compiler)
 - #72757 (rustc_lexer: Optimize shebang detection slightly)
 - #72772 (miri validation: clarify valid values of 'char')
 - #72773 (Fix is_char_boundary documentation)
 - #72777 (rustdoc: remove calls to `local_def_id_from_node_id`)

Failed merges:

r? @ghost

1 files changed, 3 insertions, 4 deletions

diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index b514e0f6d9c..316c2cd55ac 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -2270,12 +2270,11 @@ impl str {
         self.len() == 0
     }
 
-    /// Checks that `index`-th byte lies at the start and/or end of a
-    /// UTF-8 code point sequence.
+    /// Checks that `index`-th byte is the first byte in a UTF-8 code point
+    /// sequence or the end of the string.
     ///
     /// The start and end of the string (when `index == self.len()`) are
-    /// considered to be
-    /// boundaries.
+    /// considered to be boundaries.
     ///
     /// Returns `false` if `index` is greater than `self.len()`.
     ///