Rollup merge of #47216 - SergioBenitez:doc-fix, r=Mark-Simulacrum

Clarify appending behavior of 'io::Read::read_to_string()'.

A simple doc clarification.

src/libstd/io/mod.rs

@@ -601,7 +601,7 @@ fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize> {
         read_to_end(self, buf)
     }
 
-    /// Read all bytes until EOF in this source, placing them into `buf`.
+    /// Read all bytes until EOF in this source, appending them to `buf`.
     ///
     /// If successful, this function returns the number of bytes which were read
     /// and appended to `buf`.