Update launchProjectile API (#11300)

patches/api/Fix-upstream-javadocs.patch

@@ -1719,6 +1719,32 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
       *
       * @return Set containing all the channels that this client may accept.
       */
+diff --git a/src/main/java/org/bukkit/projectiles/ProjectileSource.java b/src/main/java/org/bukkit/projectiles/ProjectileSource.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/projectiles/ProjectileSource.java
++++ b/src/main/java/org/bukkit/projectiles/ProjectileSource.java
+@@ -0,0 +0,0 @@ public interface ProjectileSource {
+ 
+     /**
+      * Launches a {@link Projectile} from the ProjectileSource.
++     * <p>
++     * The family of launchProjectile methods only promise the ability to launch projectile types
++     * that the {@link ProjectileSource} is capable of firing in vanilla.
++     * Any other types of projectiles *may* be implemented but are not part of the method contract.
+      *
+      * @param <T> a projectile subclass
+      * @param projectile class of the projectile to launch
+@@ -0,0 +0,0 @@ public interface ProjectileSource {
+     /**
+      * Launches a {@link Projectile} from the ProjectileSource with an
+      * initial velocity.
++     * <p>
++     * The family of launchProjectile methods only promise the ability to launch projectile types
++     * that the {@link ProjectileSource} is capable of firing in vanilla.
++     * Any other types of projectiles *may* be implemented but are not part of the method contract.
+      *
+      * @param <T> a projectile subclass
+      * @param projectile class of the projectile to launch
 diff --git a/src/main/java/org/bukkit/scoreboard/Objective.java b/src/main/java/org/bukkit/scoreboard/Objective.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/scoreboard/Objective.java