Fix typo in comment

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/10105)

e_os.h

@@ -42,7 +42,7 @@
 #   endif
 /*
  * Some operating systems do not permit select(2) on their random devices,
- * defining this to zero will force the used of read(2) to extract one byte
+ * defining this to zero will force the use of read(2) to extract one byte
  * from /dev/random.
  */
 #   ifndef DEVRANDM_WAIT_USE_SELECT