Javadoc issues

[dmlloyd]

There are a number of warnings when building javadocs which should be fixed. Once the problems are fixed, we can move to more strict doclint checking.

For example:

[INFO] --- maven-javadoc-plugin:3.10.0:javadoc (default-cli) @ smallrye-common-annotation ---
[INFO] No previous run data found, generating javadoc.
Warning:  Javadoc Warnings
Warning:  /home/runner/work/smallrye-common/smallrye-common/annotation/src/main/java/io/smallrye/common/annotation/Identifier.java:39: warning: no comment
Warning:  public static Literal of(String value) {
Warning:  ^
Warning:  /home/runner/work/smallrye-common/smallrye-common/annotation/src/main/java/module-info.java:1: warning: no comment
Warning:  module io.smallrye.common.annotation {
Warning:  ^
Warning:  /home/runner/work/smallrye-common/smallrye-common/annotation/src/main/java/io/smallrye/common/annotation/Identifier.java:37: warning: no comment
Warning:  private final String value;
Warning:  ^
Warning:  Note: Custom tags that could override future standard tags:  @implSpec, @apiNote, @implNote. To avoid potential overrides, use at least one period character (.) in custom tag names.
Warning:  Note: Custom tags that were not seen:  @implSpec, @apiNote, @implNote
Warning: [WARNING] 3 warnings