Correct docs in Arc and Rc.

A number of trait implementations incorrectly claimed to be zero cost.

Author: JakobDegen

library/std/src/ffi/c_str.rs

@@ -973,7 +973,8 @@ impl<'a> From<&'a CString> for Cow<'a, CStr> {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<CString> for Arc<CStr> {
-    /// Converts a [`CString`] into an <code>[Arc]<[CStr]></code> without copying or allocating.
+    /// Converts a [`CString`] into an <code>[Arc]<[CStr]></code> by moving the [`CString`]
+    /// data into a new [`Arc`] buffer.
     #[inline]
     fn from(s: CString) -> Arc<CStr> {
         let arc: Arc<[u8]> = Arc::from(s.into_inner());
@@ -992,7 +993,8 @@ impl From<&CStr> for Arc<CStr> {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<CString> for Rc<CStr> {
-    /// Converts a [`CString`] into an <code>[Rc]<[CStr]></code> without copying or allocating.
+    /// Converts a [`CString`] into an <code>[Rc]<[CStr]></code> by moving the [`CString`]
+    /// data into a new [`Arc`] buffer.
     #[inline]
     fn from(s: CString) -> Rc<CStr> {
         let rc: Rc<[u8]> = Rc::from(s.into_inner());

library/std/src/ffi/os_str.rs

@@ -989,7 +989,8 @@ impl Clone for Box<OsStr> {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<OsString> for Arc<OsStr> {
-    /// Converts an [`OsString`] into an <code>[Arc]<[OsStr]></code> without copying or allocating.
+    /// Converts an [`OsString`] into an <code>[Arc]<[OsStr]></code> by moving the [`OsString`]
+    /// data into a new [`Arc`] buffer.
     #[inline]
     fn from(s: OsString) -> Arc<OsStr> {
         let arc = s.inner.into_arc();
@@ -1008,7 +1009,8 @@ impl From<&OsStr> for Arc<OsStr> {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<OsString> for Rc<OsStr> {
-    /// Converts an [`OsString`] into an <code>[Rc]<[OsStr]></code> without copying or allocating.
+    /// Converts an [`OsString`] into an <code>[Rc]<[OsStr]></code> by moving the [`OsString`]
+    /// data into a new [`Rc`] buffer.
     #[inline]
     fn from(s: OsString) -> Rc<OsStr> {
         let rc = s.inner.into_rc();

library/std/src/path.rs

@@ -1766,7 +1766,8 @@ impl<'a> From<Cow<'a, Path>> for PathBuf {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<PathBuf> for Arc<Path> {
-    /// Converts a [`PathBuf`] into an [`Arc`] by moving the [`PathBuf`] data into a new [`Arc`] buffer.
+    /// Converts a [`PathBuf`] into an <code>[Arc]<[Path]></code> by moving the [`PathBuf`] data
+    /// into a new [`Arc`] buffer.
     #[inline]
     fn from(s: PathBuf) -> Arc<Path> {
         let arc: Arc<OsStr> = Arc::from(s.into_os_string());
@@ -1786,7 +1787,8 @@ impl From<&Path> for Arc<Path> {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<PathBuf> for Rc<Path> {
-    /// Converts a [`PathBuf`] into an [`Rc`] by moving the [`PathBuf`] data into a new `Rc` buffer.
+    /// Converts a [`PathBuf`] into an <code>[Rc]<[Path]></code> by moving the [`PathBuf`] data into
+    /// a new [`Rc`] buffer.
     #[inline]
     fn from(s: PathBuf) -> Rc<Path> {
         let rc: Rc<OsStr> = Rc::from(s.into_os_string());
@@ -1796,7 +1798,7 @@ impl From<PathBuf> for Rc<Path> {
 
 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
 impl From<&Path> for Rc<Path> {
-    /// Converts a [`Path`] into an [`Rc`] by copying the [`Path`] data into a new `Rc` buffer.
+    /// Converts a [`Path`] into an [`Rc`] by copying the [`Path`] data into a new [`Rc`] buffer.
     #[inline]
     fn from(s: &Path) -> Rc<Path> {
         let rc: Rc<OsStr> = Rc::from(s.as_os_str());