Fix incorrect relationship projection key

Author: Mats-SX

doc/asciidoc/algorithms/alpha/alpha-degree-centrality.adoc

@@ -131,7 +131,7 @@ CALL gds.alpha.degree.stream({
   relationshipProjection: {
     FOLLOWS: {
       type: 'FOLLOWS',
-      projection: 'REVERSE'
+      orientation: 'REVERSE'
     }
   }
 })
@@ -148,7 +148,7 @@ CALL gds.alpha.degree.write({
   relationshipProjection: {
     FOLLOWS: {
       type: 'FOLLOWS',
-      projection: 'REVERSE'
+      orientation: 'REVERSE'
     }
   },
   writeProperty: 'followers'