patch 9.0.0828: various typos

Problem:    Various typos.
Solution:   Correct typos. (closes #11432)
diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
index 80ad88c..7ec5998 100644
--- a/src/testdir/test_textprop.vim
+++ b/src/testdir/test_textprop.vim
@@ -1896,7 +1896,7 @@
   try
     :2 del
   catch
-    assert_report('Line delete should have workd, but it raised an error.')
+    assert_report('Line delete should have worked, but it raised an error.')
   endtry
 
   # The property for line 2 (was 3) should no longer extend into the previous
@@ -1910,7 +1910,7 @@
   try
     :3 del
   catch
-    assert_report('Line delete should have workd, but it raised an error.')
+    assert_report('Line delete should have worked, but it raised an error.')
   endtry
 
   # The property for line 2 (originally 3) should no longer extend into the next
@@ -2405,7 +2405,7 @@
   exec 'setlocal fileformat=' . a:ff
 
   " Fill the buffer with varying length lines. We need a suitably large number
-  " to force Vim code through paths wehere previous error have occurred. This
+  " to force Vim code through paths where previous error have occurred. This
   " is more 'art' than 'science'.
   let text = 'a'
   call setline(1, text)
@@ -2448,7 +2448,7 @@
   setlocal fileformat=unix
 
   " Fill the buffer with varying length lines. We need a suitably large number
-  " to force Vim code through paths wehere previous error have occurred. This
+  " to force Vim code through paths where previous error have occurred. This
   " is more 'art' than 'science'.
   let text = 'aa'
   call setline(1, text)