Various minor typos in documentation and comments
diff --git a/Modules/_io/stringio.c b/Modules/_io/stringio.c
index 9d73884..95fb703 100644
--- a/Modules/_io/stringio.c
+++ b/Modules/_io/stringio.c
@@ -711,7 +711,7 @@
     /* If newline == "", we don't translate anything.
        If newline == "\n" or newline == None, we translate to "\n", which is
        a no-op.
-       (for newline == None, TextIOWrapper translates to os.sepline, but it
+       (for newline == None, TextIOWrapper translates to os.linesep, but it
        is pointless for StringIO)
     */
     if (newline != NULL && newline[0] == '\r') {