Update library/std/src/io/error.rs

Co-authored-by: nora <[email protected]>

Author: aviramha

library/std/src/io/error.rs

@@ -401,7 +401,7 @@ pub enum ErrorKind {
     OutOfMemory,
 
     /// The operation was partially successful and needs to be checked
-    /// later on due to not blocking
+    /// later on due to not blocking.
     #[unstable(feature = "io_error_inprogress", issue = "none")]
     InProgress,