update manual for restart limit

The manual here:

Lines 38 to 41 in 8b5e91f

    
           The wave model routine ({\F 
        
             w3wave}) optionally generates up to 9 restart files {\file 
        
             restart{\em{n}}.ww3}, where {\file{\em{n}}} represents a single digit 
        
           integer number. For telescoping nest applications, the wave model also

says there is only 9 restarts allowed, which is outdated and should be corrected.

	The wave model routine ({\F
	w3wave}) optionally generates up to 9 restart files {\file
	restart{\em{n}}.ww3}, where {\file{\em{n}}} represents a single digit
	integer number. For telescoping nest applications, the wave model also