Properly fix JavaDoc linting issues

Fixes our own, and upstream's, issues with the stricter Java 8 JavaDoc
linter.

Also removes the destroystokyo-release maven repository. I'm not sure
why I added it originally, but it's unnecessary now.

Spigot-API-Patches/Add-fromBottle-flag-to-Experience-Orbs.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Add fromBottle flag to Experience Orbs
 
 
 diff --git a/src/main/java/org/bukkit/entity/ExperienceOrb.java b/src/main/java/org/bukkit/entity/ExperienceOrb.java
-index c286edfd..bcb68fa7 100644
+index c286edfd..e8a83c06 100644
 --- a/src/main/java/org/bukkit/entity/ExperienceOrb.java
 +++ b/src/main/java/org/bukkit/entity/ExperienceOrb.java
 @@ -0,0 +0,0 @@ public interface ExperienceOrb extends Entity {
@@ -14,7 +14,9 @@ index c286edfd..bcb68fa7 100644
      public void setExperience(int value);
 +
 +    /**
-+     * Check if this orb was spawned from a ThrownExpBottle
++     * Check if this orb was spawned from a {@link ThrownExpBottle}
++     *
++     * @return if orb was spawned from a bottle
 +     */
 +    public boolean isFromBottle();
  }