patch 8.1.0528: various typos in comments
Problem: Various typos in comments.
Solution: Fix the typos.
diff --git a/src/testdir/README.txt b/src/testdir/README.txt
index c649259..b3200a4 100644
--- a/src/testdir/README.txt
+++ b/src/testdir/README.txt
@@ -54,7 +54,7 @@
TO ADD A SCREEN DUMP TEST:
-Mostly the same as writing a new style test. Additonally, see help on
+Mostly the same as writing a new style test. Additionally, see help on
"terminal-dumptest". Put the reference dump in "dumps/Test_func_name.dump".