Add Javadoc for selector arguments

cloud-minecraft/cloud-bukkit/src/main/java/cloud/commandframework/bukkit/parsers/selector/MultipleEntitySelectorArgument.java

@@ -35,6 +35,14 @@ import org.bukkit.entity.Entity;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
+/**
+ * Argument type for parsing {@link MultipleEntitySelector}. On Minecraft 1.13+
+ * this argument uses Minecraft's built-in entity selector argument for parsing
+ * and suggestions. On prior versions, this argument will suggest nothing and
+ * always fail parsing with {@link SelectorParseException.FailureReason#UNSUPPORTED_VERSION}.
+ *
+ * @param <C> sender type
+ */
 public final class MultipleEntitySelectorArgument<C> extends CommandArgument<C, MultipleEntitySelector> {
 
     private MultipleEntitySelectorArgument(

cloud-minecraft/cloud-bukkit/src/main/java/cloud/commandframework/bukkit/parsers/selector/MultiplePlayerSelectorArgument.java

@@ -41,6 +41,14 @@ import org.bukkit.entity.Player;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
+/**
+ * Argument type for parsing {@link MultiplePlayerSelector}. On Minecraft 1.13+
+ * this argument uses Minecraft's built-in entity selector argument for parsing
+ * and suggestions. On prior versions, this argument behaves similarly to
+ * {@link PlayerArgument}.
+ *
+ * @param <C> sender type
+ */
 public final class MultiplePlayerSelectorArgument<C> extends CommandArgument<C, MultiplePlayerSelector> {
 
     private MultiplePlayerSelectorArgument(

cloud-minecraft/cloud-bukkit/src/main/java/cloud/commandframework/bukkit/parsers/selector/SingleEntitySelectorArgument.java

@@ -34,6 +34,14 @@ import org.apiguardian.api.API;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
+/**
+ * Argument type for parsing {@link SingleEntitySelector}. On Minecraft 1.13+
+ * this argument uses Minecraft's built-in entity selector argument for parsing
+ * and suggestions. On prior versions, this argument will suggest nothing and
+ * always fail parsing with {@link SelectorParseException.FailureReason#UNSUPPORTED_VERSION}.
+ *
+ * @param <C> sender type
+ */
 public final class SingleEntitySelectorArgument<C> extends CommandArgument<C, SingleEntitySelector> {
 
     private SingleEntitySelectorArgument(

cloud-minecraft/cloud-bukkit/src/main/java/cloud/commandframework/bukkit/parsers/selector/SinglePlayerSelectorArgument.java

@@ -40,6 +40,14 @@ import org.bukkit.entity.Player;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
+/**
+ * Argument type for parsing {@link SinglePlayerSelector}. On Minecraft 1.13+
+ * this argument uses Minecraft's built-in entity selector argument for parsing
+ * and suggestions. On prior versions, this argument behaves similarly to
+ * {@link PlayerArgument}.
+ *
+ * @param <C> sender type
+ */
 public final class SinglePlayerSelectorArgument<C> extends CommandArgument<C, SinglePlayerSelector> {
 
     private SinglePlayerSelectorArgument(