<?php

namespace SearchApi\Builders;

use SearchApi\Builders\QueryBuilder;

/**
 * Class SolrQueryBuilder - Responsible for building a query string for SolrSearch
 */
class SolrQueryBuilder implements QueryBuilder {
  /**
   * Build a query string from provided search terms and search options
   */
  function build( $keywords, $options = null ) {
    return null;
  }
}

<?php

namespace SearchApi\Builders;

use SearchApi\Builders\QueryBuilder;

/**
 * Responsible for building a query string for SolrSearch
 */
class SolrQueryBuilder implements QueryBuilder {
  /**
   * Build a query string from provided search terms and search options
   */
  function build( $keywords, $options = null ) {
    return null;
  }
}

Remove class name from docs
Remove class name from docs