Indicate that the annotations classes are for internal use only.

Author: baron1405

src/main/java/org/cthing/versionparser/internal/annotations/PackageNonnullByDefault.java

@@ -26,11 +26,14 @@
 
 
 /**
+ * For internal use only.
+ * <p>
  * Declares that fields, method return types, method parameters, and type parameters within the annotated package
  * are not {@code null} by default. Items that can be null should be annotated with either
  * {@link javax.annotation.CheckForNull} or {@link javax.annotation.Nullable}. This annotation differs from
  * {@link javax.annotation.ParametersAreNonnullByDefault} which only marks method parameters as not {@code null}
  * by default.
+ * </p>
  */
 @Documented
 @Nonnull

src/main/java/org/cthing/versionparser/internal/annotations/UtilityClass.java

@@ -24,8 +24,11 @@
 
 
 /**
+ * For internal use only.
+ * <p>
  * Annotation for the private constructor of a utility class. Can be used by IntelliJ to eliminate the constructor
  * from test coverage analysis.
+ * </p>
  */
 @Retention(RetentionPolicy.CLASS)
 @Target(ElementType.CONSTRUCTOR)

src/main/java/org/cthing/versionparser/internal/annotations/package-info.java

@@ -15,6 +15,9 @@
  */
 
 /**
+ * For internal use only.
+ * <p>
  * Annotations for nullability.
+ * </p>
  */
 package org.cthing.versionparser.internal.annotations;