Update encode_utf16 to mention it is native endian

library/alloc/src/string.rs

@@ -712,8 +712,8 @@ impl String {
         }
     }
 
-    /// Decode a UTF-16–encoded vector `v` into a `String`, returning [`Err`]
-    /// if `v` contains any invalid data.
+    /// Decode a native endian UTF-16–encoded vector `v` into a `String`,
+    /// returning [`Err`] if `v` contains any invalid data.
     ///
     /// # Examples
     ///
@@ -745,8 +745,8 @@ impl String {
         Ok(ret)
     }
 
-    /// Decode a UTF-16–encoded slice `v` into a `String`, replacing
-    /// invalid data with [the replacement character (`U+FFFD`)][U+FFFD].
+    /// Decode a native endian UTF-16–encoded slice `v` into a `String`,
+    /// replacing invalid data with [the replacement character (`U+FFFD`)][U+FFFD].
     ///
     /// Unlike [`from_utf8_lossy`] which returns a [`Cow<'a, str>`],
     /// `from_utf16_lossy` returns a `String` since the UTF-16 to UTF-8
@@ -777,8 +777,8 @@ impl String {
             .collect()
     }
 
-    /// Decode a UTF-16LE–encoded vector `v` into a `String`, returning [`Err`]
-    /// if `v` contains any invalid data.
+    /// Decode a UTF-16LE–encoded vector `v` into a `String`,
+    /// returning [`Err`] if `v` contains any invalid data.
     ///
     /// # Examples
     ///
@@ -852,8 +852,8 @@ impl String {
         }
     }
 
-    /// Decode a UTF-16BE–encoded vector `v` into a `String`, returning [`Err`]
-    /// if `v` contains any invalid data.
+    /// Decode a UTF-16BE–encoded vector `v` into a `String`,
+    /// returning [`Err`] if `v` contains any invalid data.
     ///
     /// # Examples
     ///

library/core/src/char/methods.rs

@@ -92,7 +92,7 @@ impl char {
     #[stable(feature = "assoc_char_consts", since = "1.52.0")]
     pub const UNICODE_VERSION: (u8, u8, u8) = crate::unicode::UNICODE_VERSION;
 
-    /// Creates an iterator over the UTF-16 encoded code points in `iter`,
+    /// Creates an iterator over the native endian UTF-16 encoded code points in `iter`,
     /// returning unpaired surrogates as `Err`s.
     ///
     /// # Examples
@@ -704,7 +704,7 @@ impl char {
         unsafe { from_utf8_unchecked_mut(encode_utf8_raw(self as u32, dst)) }
     }
 
-    /// Encodes this character as UTF-16 into the provided `u16` buffer,
+    /// Encodes this character as native endian UTF-16 into the provided `u16` buffer,
     /// and then returns the subslice of the buffer that contains the encoded character.
     ///
     /// # Panics
@@ -1828,7 +1828,7 @@ pub const fn encode_utf8_raw(code: u32, dst: &mut [u8]) -> &mut [u8] {
     unsafe { slice::from_raw_parts_mut(dst.as_mut_ptr(), len) }
 }
 
-/// Encodes a raw `u32` value as UTF-16 into the provided `u16` buffer,
+/// Encodes a raw `u32` value as native endian UTF-16 into the provided `u16` buffer,
 /// and then returns the subslice of the buffer that contains the encoded character.
 ///
 /// Unlike `char::encode_utf16`, this method also handles codepoints in the surrogate range.

library/core/src/str/mod.rs

@@ -1108,7 +1108,8 @@ impl str {
         LinesAny(self.lines())
     }
 
-    /// Returns an iterator of `u16` over the string encoded as UTF-16.
+    /// Returns an iterator of `u16` over the string encoded
+    /// as native endian UTF-16 (without byte-order mark).
     ///
     /// # Examples
     ///