docs: Add DESCRIPTION token example with AST tree

[vivek-bandi]

Issue: #17882

Command used

java -jar checkstyle-13.2.0-all.jar -j src/Test.java | sed "s/\[[0-9]\+:[0-9]\+\]//g"

Test.java

:Test % cat src/Test.java 

/**
 * @param value The parameter description goes here.
 */
  public void Test(String value) {

  }

AST

Test % java -jar checkstyle-13.2.0-all.jar -j src/Test.java | sed "s/\[[0-9]\+:[0-9]\+\]//g"
JAVADOC_CONTENT -> JAVADOC_CONTENT [0:1]
|--TEXT -> /** [0:1]
|--NEWLINE -> \n [0:4]
|--LEADING_ASTERISK ->  * [1:1]
|--TEXT ->   [1:3]
`--JAVADOC_BLOCK_TAG -> JAVADOC_BLOCK_TAG [1:4]
    `--PARAM_BLOCK_TAG -> PARAM_BLOCK_TAG [1:4]
        |--AT_SIGN -> @ [1:4]
        |--TAG_NAME -> param [1:5]
        |--TEXT ->   [1:10]
        |--PARAMETER_NAME -> value [1:11]
        `--DESCRIPTION -> DESCRIPTION [1:16]
            |--TEXT ->  The parameter description goes here. [1:16]
            |--NEWLINE -> \n [1:53]
            |--LEADING_ASTERISK ->  * [2:1]
            |--TEXT -> / [2:3]
            |--NEWLINE -> \n [2:4]
            |--TEXT -> public void Test(String value) { [3:1]
            |--NEWLINE -> \n [3:33]
            |--NEWLINE -> \n [4:1]
            `--TEXT -> } [5:1]

[romani]

Thanks a lot

[romani]

Please remove \n from commit message, to let CI pass

[vivek-bandi]

there is no \n in my commit message but still I've changed the commit message but some are failing can you please mention how can I pass them.

[vivek-0509]

@vivek-bandi the prefix should be doc not docs ,please change

[vivek-bandi]

sorry for multiple force pushes just trying to figure out how things are working.

[romani]

Better to have prefix as issue