patch 8.2.3914: various spelling mistakes in comments

Problem:    Various spelling mistakes in comments.
Solution:   Fix the mistakes. (Dominique Pellé, closes #9416)
diff --git a/src/vim.h b/src/vim.h
index 6427380..55bb7cd 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1012,7 +1012,7 @@
 #define DOBUF_UNLOAD	2	// unload specified buffer(s)
 #define DOBUF_DEL	3	// delete specified buffer(s) from buflist
 #define DOBUF_WIPE	4	// delete specified buffer(s) really
-#define DOBUF_WIPE_REUSE 5	// like DOBUF_WIPE an keep number for reuse
+#define DOBUF_WIPE_REUSE 5	// like DOBUF_WIPE and keep number for reuse
 
 // Values for start argument for do_buffer()
 #define DOBUF_CURRENT	0	// "count" buffer from current buffer