Below is a fix for a typo in src/lib/libc/stdio/stdio.3.
Lewis
--- stdio.3.orig 2018-02-21 16:05:22.000000000 -0600
+++ stdio.3 2018-02-21 16:07:01.000000000 -0600
@@ -137,7 +137,7 @@
freshly-opened streams that refer to terminal devices
default to line buffering, and
pending output to such streams is written automatically
-whenever an such an input stream is read.
+whenever such an input stream is read.
Note that this applies only to
.Dq "true reads" ;
if the read request can be satisfied by existing buffered data,