tweaks: remove a redundant "struct" word, and replace it in comments

src/cut.c

@@ -207,7 +207,7 @@ void do_cut_text_void(void)
  * was moved, blow away previous contents of the cutbuffer. */
 void do_copy_text(void)
 {
-	static struct filestruct *next_contiguous_line = NULL;
+	static filestruct *next_contiguous_line = NULL;
 	bool mark_is_set = (openfile->mark != NULL);
 
 	/* Remember the current viewport and cursor position. */

src/global.c

@@ -1427,7 +1427,7 @@ const char *flagtostr(int flag)
 
 #ifdef ENABLE_NANORC
 /* Interpret a function string given in the rc file, and return a
- * shortcut struct with the corresponding function filled in. */
+ * shortcut record with the corresponding function filled in. */
 sc *strtosc(const char *input)
 {
 	sc *s = nmalloc(sizeof(sc));

src/nano.c

@@ -476,7 +476,7 @@ void ingraft_buffer(filestruct *somebuffer)
 #endif
 
 	/* If we pasted onto the first line of the edit window, the corresponding
-	 * struct has been freed, so... point at the start of the copied text. */
+	 * record has been freed, so... point at the start of the copied text. */
 	if (edittop_inside)
 		openfile->edittop = openfile->fileage;
 

src/text.c

@@ -1290,7 +1290,7 @@ void discard_until(const undo *thisitem, openfilestruct *thefile, bool keep)
 		thefile->last_saved = (undo *)0xbeeb;
 }
 
-/* Add a new undo struct of the given type to the top of the current pile. */
+/* Add a new undo item of the given type to the top of the current pile. */
 void add_undo(undo_type action)
 {
 	undo *u = openfile->current_undo;