Auto merge of #44098 - frewsxcv:rollup, r=frewsxcv

Rollup of 7 pull requests

- Successful merges: #43776, #43966, #43979, #44072, #44086, #44090, #44091
- Failed merges:

5 files changed, 7 insertions, 7 deletions

diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 0fff833e7d8..074ab3ebd8f 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -522,7 +522,7 @@ pub trait Read {
     /// `Read`er - the method only takes `&self` so that it can be used through
     /// trait objects.
     ///
-    /// # Unsafety
+    /// # Safety
     ///
     /// This method is unsafe because a `Read`er could otherwise return a
     /// non-zeroing `Initializer` from another `Read` type without an `unsafe`
@@ -903,7 +903,7 @@ impl Initializer {
 
     /// Returns a new `Initializer` which will not zero out buffers.
     ///
-    /// # Unsafety
+    /// # Safety
     ///
     /// This may only be called by `Read`ers which guarantee that they will not
     /// read from buffers passed to `Read` methods, and that the return value of
diff --git a/src/libstd/memchr.rs b/src/libstd/memchr.rs
index 98642f86f4d..240e82069ff 100644
--- a/src/libstd/memchr.rs
+++ b/src/libstd/memchr.rs
@@ -20,7 +20,7 @@
 /// magnitude faster than `haystack.iter().position(|&b| b == needle)`.
 /// (See benchmarks.)
 ///
-/// # Example
+/// # Examples
 ///
 /// This shows how to find the first position of a byte in a byte string.
 ///
@@ -40,7 +40,7 @@ pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
 /// Returns the index corresponding to the last occurrence of `needle` in
 /// `haystack`, or `None` if one is not found.
 ///
-/// # Example
+/// # Examples
 ///
 /// This shows how to find the last position of a byte in a byte string.
 ///
diff --git a/src/libstd/sys/redox/ext/mod.rs b/src/libstd/sys/redox/ext/mod.rs
index 259cda5bcb3..9fd8d6c9186 100644
--- a/src/libstd/sys/redox/ext/mod.rs
+++ b/src/libstd/sys/redox/ext/mod.rs
@@ -13,7 +13,7 @@
 //! For now, this module is limited to extracting file descriptors,
 //! but its functionality will grow over time.
 //!
-//! # Example
+//! # Examples
 //!
 //! ```no_run
 //! use std::fs::File;
diff --git a/src/libstd/sys/unix/ext/mod.rs b/src/libstd/sys/unix/ext/mod.rs
index 67fe46cc9c7..98bc90dd4e1 100644
--- a/src/libstd/sys/unix/ext/mod.rs
+++ b/src/libstd/sys/unix/ext/mod.rs
@@ -13,7 +13,7 @@
 //! For now, this module is limited to extracting file descriptors,
 //! but its functionality will grow over time.
 //!
-//! # Example
+//! # Examples
 //!
 //! ```no_run
 //! use std::fs::File;
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index ee103c803f5..6354e746af2 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -807,7 +807,7 @@ pub fn park_timeout_ms(ms: u32) {
 /// Platforms which do not support nanosecond precision for sleeping will have
 /// `dur` rounded up to the nearest granularity of time they can sleep for.
 ///
-/// # Example
+/// # Examples
 ///
 /// Waiting for the complete expiration of the timeout:
 ///