tweaks: normalize the indentation after the previous change

Also improve a comment.

src/cut.c

@@ -560,7 +560,9 @@ void copy_marked_region(void)
 	botline->next = afterline;
 }
 
-/* Copy text from the current buffer into the cutbuffer. */
+/* Copy text from the current buffer into the cutbuffer.  The text is either
+ * the marked region, the whole line, the text from cursor to end-of-line,
+ * just the line break, or nothing, depending on mode and cursor position. */
 void copy_text(void)
 {
 	bool at_eol = (openfile->current->data[openfile->current_x] == '\0');