net: fix ambiguity in TcpStream::try_write_vectored docs (#7067)

Author: Aeon

tokio/src/net/tcp/stream.rs

@@ -920,7 +920,7 @@ impl TcpStream {
     /// were written.
     ///
     /// Data is written from each buffer in order, with the final buffer read
-    /// from possible being only partially consumed. This method behaves
+    /// from possibly being only partially consumed. This method behaves
     /// equivalently to a single call to [`try_write()`] with concatenated
     /// buffers.
     ///