Add generated source path to javadoc configuration

The monorepo has sources in both src/main/java and src/generated/java.
Javadoc needs both paths to resolve imports from generated packages.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: edburns

pom.xml

@@ -189,7 +189,7 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>3.11.2</version>
                 <configuration>
-                    <sourcepath>${monorepo.java.dir}/src/main/java</sourcepath>
+                    <sourcepath>${monorepo.java.dir}/src/main/java:${monorepo.java.dir}/src/generated/java</sourcepath>
                     <subpackages>com.github.copilot</subpackages>
                 </configuration>
                 <reportSets>