patch 9.0.0828: various typos

Problem:    Various typos.
Solution:   Correct typos. (closes #11432)
diff --git a/src/drawline.c b/src/drawline.c
index e849f9d..632fd74 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -2041,7 +2041,7 @@
 				    text_prop_follows = TRUE;
 
 				// When 'wrap' is off then for "below" we need
-				// to start a new line explictly.
+				// to start a new line explicitly.
 				if (start_line)
 				{
 				    draw_screen_line(wp, &wlv);