Rollup merge of rust-lang#71296 - ChiefMilesEdgeworth:fix_doc_wording…

…, r=Dylan-DPC

Change wording on read_vectored docs

Closes rust-lang#70154

I'm happy to work with others to make the wording on this more clear. I think what I have is an improvement but may not be the final wording.

src/libstd/io/mod.rs

@@ -571,8 +571,9 @@ pub trait Read {
     /// Like `read`, except that it reads into a slice of buffers.
     ///
     /// Data is copied to fill each buffer in order, with the final buffer
-    /// written to possibly being only partially filled. This method must behave
-    /// as a single call to `read` with the buffers concatenated would.
+    /// written to possibly being only partially filled. This method must
+    /// behave equivalently to a single call to `read` with concatenated
+    /// buffers.
     ///
     /// The default implementation calls `read` with either the first nonempty
     /// buffer provided, or an empty one if none exists.