Question

What type of punctuation signals the reader that words from the direct quote have been changed but the writer ?

Answer 1

That would have to be an ellipsis. When you say something like, "There was only one catch, and that was Catch-22, which specified that a concern for one's own safety in the face of dangers that were real and immediate was the process of a rational mind. Orr was crazy and could be grounded (blah blah)"(Joseph Heller 46).

OR

,"There was only one catch, and that was Catch-22,...Orr was crazy and could be grounded (blah blah)"(Joseph Heller 46).