Clarify inconsistent docs on DaggerBroadcastReceiver

Fixes #1031

RELNOTES=Clarified `DaggerBroadcastReceiver` documentation with respect to when injection is performed

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=182056847

java/dagger/android/DaggerBroadcastReceiver.java

@@ -23,8 +23,8 @@
 import dagger.internal.Beta;
 
 /**
- * A {@link BroadcastReceiver} that injects its members in the first call to {@link
- * #onReceive(Context, Intent)}.
+ * A {@link BroadcastReceiver} that injects its members in every call to {@link #onReceive(Context,
+ * Intent)}.
  *
  * <p>This class should only be used for {@link BroadcastReceiver}s that are declared in an {@code
  * AndroidManifest.xml}. If, instead, the {@link BroadcastReceiver} is created in code, prefer