Merge pull request #323 from azure-javaee/edburns-msft-jea-339-absorb…

…-assertions-from-cdi-integration-spec

On branch edburns-msft-jea-339-absorb-assertions-from-cdi-integration Built-in beans from CDI integration spec.

spec/src/main/asciidoc/concepts.adoc

@@ -76,3 +76,11 @@ Attributes on these annotations, as well as on the annotations referenced from t
 For more information, see the package javadoc for the jakarta.security.enterprise package.
 
 Jakarta Expression Language, version 5.0 [https://jakarta.ee/specifications/expression-language/5.0/[EL50]] is a Jakarta EE specification.
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+==== Built-in beans, not otherwise specified
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+Several other sections in this specification mention built-in beans. This section details the required built-in beans that are not specified elsewhere.
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+A Jakarta EE or embeddable EJB container must provide the following built-in beans, all of which have qualifier `@Default`:
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+* a bean with bean type `java.security.Principal`, allowing injection of a `Principal` representing the current caller identity.