Formatting JavaDoc extra spaces

[magestacks]

Changes proposed in this pull request:

• Formatting JavaDoc extra spaces

before:

public interface Projection {
    
    /**
     * Get column name.
     * 
     * @return column name
     */
    String getColumnName();
}

after:

public interface Projection {
    
    /**
     * Get column name.
     *
     * @return column name
     */
    String getColumnName();
}

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Before committing this PR, I'm sure that I have checked the following options:

• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
• I have (or in comment I request) added corresponding labels for the pull request.
• I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.