Polish Javadoc for ColumnMapRowMapper

See gh-26823

spring-jdbc/src/main/java/org/springframework/jdbc/core/ColumnMapRowMapper.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,8 +31,8 @@ import org.springframework.util.LinkedCaseInsensitiveMap;
  * entry for each column, with the column name as key.
  *
  * <p>The Map implementation to use and the key to use for each column
- * in the column Map can be customized through overriding
- * {@link #createColumnMap} and {@link #getColumnKey}, respectively.
+ * in the column Map can be customized by overriding {@link #createColumnMap}
+ * and {@link #getColumnKey}, respectively.
  *
  * <p><b>Note:</b> By default, {@code ColumnMapRowMapper} will try to build a linked Map
  * with case-insensitive keys, to preserve column order as well as allow any
@@ -71,6 +71,7 @@ public class ColumnMapRowMapper implements RowMapper<Map<String, Object>> {
 
 	/**
 	 * Determine the key to use for the given column in the column Map.
+	 * <p>By default, the supplied column name will be returned unmodified.
 	 * @param columnName the column name as returned by the ResultSet
 	 * @return the column key to use
 	 * @see java.sql.ResultSetMetaData#getColumnName
@@ -83,9 +84,9 @@ public class ColumnMapRowMapper implements RowMapper<Map<String, Object>> {
 	 * Retrieve a JDBC object value for the specified column.
 	 * <p>The default implementation uses the {@code getObject} method.
 	 * Additionally, this implementation includes a "hack" to get around Oracle
-	 * returning a non standard object for their TIMESTAMP datatype.
-	 * @param rs is the ResultSet holding the data
-	 * @param index is the column index
+	 * returning a non standard object for their TIMESTAMP data type.
+	 * @param rs the ResultSet holding the data
+	 * @param index the column index
 	 * @return the Object returned
 	 * @see org.springframework.jdbc.support.JdbcUtils#getResultSetValue
 	 */