Update gradle-wapper and fix javadoc build

Author: TBlueF

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

src/main/java/de/bluecolored/bluemap/api/BlueMapMap.java

@@ -69,7 +69,7 @@ public interface BlueMapMap {
 	Vector2i getTileOffset();
 
 	/**
-	 * <p></p>Sets a filter that determines if a specific (hires) tile of this map should be updated or not.
+	 * <p>Sets a filter that determines if a specific (hires) tile of this map should be updated or not.
 	 * If this filter returns false for a tile, the "render"-process of this tile will be cancelled and the tile will be left untouched.</p>
 	 * <p><b>Warning:</b> Using this method will harm the integrity of the map! Since BlueMap will still assume that the tile got updated properly.</p>
 	 * <p>Any previously set filters will get overwritten with the new one. You can get the current filter using {@link #getTileFilter()} and combine them if you wish.</p>