Remove NPO and SPO from appendixB.rst

The NPO and SPO polylines were removed in MET version 6.1 since they both contain holes. NPO contains the Aleutian Islands and SPO contains Hawaii. The polyline format does not support shapes with holes in them.

docs/Users_Guide/appendixB.rst

@@ -136,8 +136,6 @@ The NCEP verification regions that are implemented in MET as lat/lon polylines a
 
 * NAK.poly for Northern Alaska
 
-* NAO.poly for Northern Atlantic Ocean
-
 * NEC.poly for the Northern East Coast
 
 * NMT.poly for the Northern Mountain Region
@@ -162,8 +160,6 @@ The NCEP verification regions that are implemented in MET as lat/lon polylines a
 
 * SPL.poly for the Southern Plains
 
-* SPO.poly for the Southern Pacific Ocean
-
 * SWC.poly for the Southern West Coast
 
 * SWD.poly for the Southwest Desert