Moves the iterator to point to the paragraph delimiter characters.
The possible characters are either a newline, a carriage return, a carriage return/newline in sequence, or the Unicode paragraph separator character.
If the iterator is already at the paragraph delimiter characters, moves to the paragraph delimiter characters for the next line. If this is on the last line in the buffer, which does not end in paragraph delimiters, moves to the end iterator (end of the last line), and returns false.
true if we moved and the new location is not the end iterator