Clean up the javadoc to pass java 8's doclint

By: Thinkofdeath <thinkofdeath@spigotmc.org>

paper-api/src/main/java/org/bukkit/map/MapCursor.java

@@ -166,6 +166,7 @@ public final class MapCursor {
 
         /**
          *
+         * @return the value 
          * @deprecated Magic value
          */
         @Deprecated
@@ -175,6 +176,8 @@ public final class MapCursor {
 
         /**
          *
+         * @param value the value
+         * @return the matching type
          * @deprecated Magic value
          */
         @Deprecated

paper-api/src/main/java/org/bukkit/map/MapView.java

@@ -135,7 +135,7 @@ public interface MapView {
     /**
      * Get a list of MapRenderers currently in effect.
      *
-     * @return A List<MapRenderer> containing each map renderer.
+     * @return A {@code List<MapRenderer>} containing each map renderer.
      */
     public List<MapRenderer> getRenderers();