JAMES-2859 Fix mailet docs plugin

[chibenwa]

No description provided.

[Arsnael]

08:18:31,238 [ERROR] Failed to execute goal org.apache.james:mailetdocs-maven-plugin:3.7.0-SNAPSHOT:mailetdocs (default) on project james-server-mailet-dkim: Execution default of goal org.apache.james:mailetdocs-maven-plugin:3.7.0-SNAPSHOT:mailetdocs failed: syntax error @[35,48] in file:/home/jenkins/workspace/james_ApacheJames_PR-839/server/mailet/dkim/src/main/java/org/apache/james/jdkim/mailets/MockPublicKeyRecordRetriever.java -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.james:mailetdocs-maven-plugin:3.7.0-SNAPSHOT:mailetdocs (default) on project james-server-mailet-dkim: Execution default of goal org.apache.james:mailetdocs-maven-plugin:3.7.0-SNAPSHOT:mailetdocs failed: syntax error @[35,48] in file:/home/jenkins/workspace/james_ApacheJames_PR-839/server/mailet/dkim/src/main/java/org/apache/james/jdkim/mailets/MockPublicKeyRecordRetriever.java

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