> Could I please get a review for this small clenup? I updated the `--help` 
> command output to match that of `man javadoc`.
> 
> I also noticed that  `--help-extended` was renamed to `--help-extra` at some 
> point but doc-comment was not changed, so I changed it.
> I could create a separate issue for it if needed, just to keep a record of it.
> 
> The new `javadoc --help` output is the following 
> 
> 
> javadoc --help
> Usage:
>     javadoc [options] [packagenames] [sourcefiles] [@files]
> where options include:
>     @<file>       Read options and filenames from file
>     --add-modules <module>(,<module>)*
>                   Root modules to resolve in addition to the initial modules,
>                   or all modules on the module path if <module> is
>                   ALL-MODULE-PATH.
>     -bootclasspath <path>
>                   Override location of platform class files used for 
> non-modular
>                   releases
>     -breakiterator
>                   Compute first sentence with BreakIterator
>     --class-path <path>, -classpath <path>, -cp <path>
>                   Specify where to find user class files
>     -doclet <class>
>                   Generate output via alternate doclet
>     -docletpath <path>
>                   Specify where to find doclet class files
>     --enable-preview
>                   Enable preview language features. To be used in conjunction 
> with
>                   either -source or --release.
>     -encoding <name>
>                   Source file encoding name
>     -exclude <pkglist>
>                   Specify a list of packages to exclude
>     --expand-requires (transitive|all)
>                   Instructs the tool to expand the set of modules to be
>                   documented. By default, only the modules given explicitly on
>                   the command line will be documented. A value of "transitive"
>                   will additionally include all "requires transitive"
>                   dependencies of those modules. A value of "all" will include
>                   all dependencies of those modules.
>     -extdirs <dirlist>
>                   Override location of installed extensions
>     --help, -help, -?, -h
>                   Display command-line options and exit
>     --help-extra, -X
>                   Print a synopsis of nonstandard options and exit
>     -J<flag>      Pass <flag> directly to the runtime system
>     --limit-modules <module>(,<module>)*
>                   Limit the universe of observable modules
>     -locale <name>
>                   Locale to be used, e.g. en_US or en...

Nizar Benalla has updated the pull request with a new target base due to a 
merge or a rebase. The incremental webrev excludes the unrelated changes 
brought in by the merge/rebase. The pull request contains five additional 
commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into javadoc-help
 - change back "Doclet" to "doclet"
 - - replace backticks with single quotes
   - drop use of underscores
   - capitalize first letter for "doclet"
 - Merge remote-tracking branch 'upstream/master' into javadoc-help
 - improve javadoc help output
   
   small clenup, --help-extended was renamed to --help-extra at some point but 
doc-comment was not changed

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20618/files
  - new: https://git.openjdk.org/jdk/pull/20618/files/e24bbd8d..d2be7550

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20618&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20618&range=02-03

  Stats: 1598 lines in 195 files changed: 1095 ins; 171 del; 332 mod
  Patch: https://git.openjdk.org/jdk/pull/20618.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20618/head:pull/20618

PR: https://git.openjdk.org/jdk/pull/20618

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