add & fix @SInCE tags, to prepare for new open-source release.

The new release will be 4.2.3, not 5.0 as originally planned.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=301833910

core/src/com/google/inject/Injector.java

@@ -278,7 +278,7 @@ public interface Injector {
    *
    * <p>This method is part of the Guice SPI and is intended for use by tools and extensions.
    *
-   * @since 5.0
+   * @since 4.2.3
    */
   List<Element> getElements();
 
@@ -295,7 +295,7 @@ public interface Injector {
    *
    * <p>This method is part of the Guice SPI and is intended for use by tools and extensions.
    *
-   * @since 5.0
+   * @since 4.2.3
    */
   Map<TypeLiteral<?>, List<InjectionPoint>> getAllMembersInjectorInjectionPoints();
 }

core/src/com/google/inject/multibindings/MapBinderBinding.java

@@ -53,7 +53,7 @@ public interface MapBinderBinding<T> {
    * {@code Map<K, Collection<com.google.inject.Provider<V>>>}, {@code Map<K,
    * Collection<javax.inject.Provider<V>>>}, and {@code Map<K, Set<V>}.
    *
-   * @since 5.0
+   * @since 4.2.3
    */
   Set<Key<?>> getAlternateMapKeys();
 

core/src/com/google/inject/multibindings/MultibinderBinding.java

@@ -49,7 +49,7 @@ public interface MultibinderBinding<T> {
    * {@code Collection<com.google.inject.Provider<V>>} and {@code
    * Collection<javax.inject.Provider<V>>}.
    *
-   * @since 5.0
+   * @since 4.2.3
    */
   Set<Key<?>> getAlternateSetKeys();
 

core/src/com/google/inject/multibindings/OptionalBinderBinding.java

@@ -47,7 +47,7 @@ public interface OptionalBinderBinding<T> {
    * entry for {@code Optional<com.google.inject.Provider<V>>} and {@code
    * Optional<javax.inject.Provider<V>>}.
    *
-   * @since 5.0
+   * @since 4.2.3
    */
   Set<Key<?>> getAlternateKeys();
 

core/src/com/google/inject/spi/MembersInjectorLookup.java

@@ -90,6 +90,7 @@ public MembersInjector<T> getDelegate() {
   /**
    * Returns the instance methods and fields that will be injected to fulfill this request.
    *
+   * @since 4.2.3
    * @return a possibly empty set of injection points. The set has a specified iteration order. All
    *     fields are returned and then all methods. Within the fields, supertype fields are returned
    *     before subtype fields. Similarly, supertype methods are returned before subtype methods.

core/src/com/google/inject/util/Modules.java

@@ -408,7 +408,11 @@ protected void configure() {
     };
   }
 
-  /** Returns a module that will configure the injector to require explicit bindings. */
+  /**
+   * Returns a module that will configure the injector to require explicit bindings.
+   *
+   * @since 4.2.3
+   */
   public static Module requireExplicitBindingsModule() {
     return new RequireExplicitBindingsModule();
   }
@@ -424,6 +428,7 @@ public void configure(Binder binder) {
    * Returns a module that will configure the injector to require {@literal @}{@link Inject} on
    * constructors.
    *
+   * @since 4.2.3
    * @see Binder#requireAtInjectOnConstructors
    */
   public static Module requireAtInjectOnConstructorsModule() {
@@ -441,6 +446,7 @@ public void configure(Binder binder) {
    * Returns a module that will configure the injector to require an exactly matching binding
    * annotation.
    *
+   * @since 4.2.3
    * @see Binder#requireExactBindingAnnotations
    */
   public static Module requireExactBindingAnnotationsModule() {
@@ -454,7 +460,11 @@ public void configure(Binder binder) {
     }
   }
 
-  /** Returns a module that will configure the injector to disable circular proxies. */
+  /**
+   * Returns a module that will configure the injector to disable circular proxies.
+   *
+   * @since 4.2.3
+   */
   public static Module disableCircularProxiesModule() {
     return new DisableCircularProxiesModule();
   }