patch 8.1.1955: tests contain typos

Problem:    Tests contain typos.
Solution:   Correct the typos. (Dominique Pelle)
diff --git a/src/testdir/test_cindent.vim b/src/testdir/test_cindent.vim
index e12e457..2cb3f24 100644
--- a/src/testdir/test_cindent.vim
+++ b/src/testdir/test_cindent.vim
@@ -815,7 +815,7 @@
         }
      }
 
-  public: // <-- this was incoreectly indented before!!
+  public: // <-- this was incorectly indented before!!
      void testfall();
   protected:
      void testfall();
@@ -1780,7 +1780,7 @@
   		}
   	}
 
-  	public: // <-- this was incoreectly indented before!!
+  	public: // <-- this was incorectly indented before!!
   	void testfall();
   	protected:
   	void testfall();