package-info for repackaged libraries (and other polishing)

spring-aop/src/main/java/org/aopalliance/aop/package-info.java

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+/**
+ * The core AOP Alliance advice marker.
+ */
+package org.aopalliance.aop;

spring-aop/src/main/java/org/aopalliance/intercept/package-info.java

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+/**
+ * The AOP Alliance reflective interception abstraction.
+ */
+package org.aopalliance.intercept;

spring-aop/src/main/java/org/aopalliance/package-info.java

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+/**
+ * Spring's variant of the AOP Alliance interfaces.
+ */
+package org.aopalliance;