[jdk21] RFR: 8300937: Update nroff pages in JDK 21 before RC

[David Holmes]

Main changes are to use 21 instead of 21-ea. In addition the following files contain additional updates from the closed sources:

- src/java.base/share/man/java.1

 [JDK-8273131](https://bugs.openjdk.org/browse/JDK-8273131): Update the java manpage markdown source for JFR filename expansion
 [JDK-8221633](https://bugs.openjdk.org/browse/JDK-8221633): StartFlightRecording: consider moving mention of multiple comma-separated parameters to the front

There are also some formatting differences related to:

 [JDK-8309670](https://bugs.openjdk.org/browse/JDK-8309670): java -help output for --module-path / -p is incomplete

Likely a different version of pandoc was used.

- src/java.base/share/man/keytool.1

 [JDK-8290626](https://bugs.openjdk.org/browse/JDK-8290626): keytool manpage contains a special character

- src/jdk.compiler/share/man/javac.1

 [JDK-8308456](https://bugs.openjdk.org/browse/JDK-8308456): Update javac tool page for -proc:full

also some formatting differences.

- src/jdk.jartool/share/man/jarsigner.1

 [JDK-8303928](https://bugs.openjdk.org/browse/JDK-8303928): Update jarsigner man page after [JDK-8303410](https://bugs.openjdk.org/browse/JDK-8303410)

- src/jdk.jcmd/share/man/jcmd.1

 [JDK-8273131](https://bugs.openjdk.org/browse/JDK-8273131): Update the java manpage markdown source for JFR filename expansion

- src/jdk.jdeps/share/man/jdeps.1

 [JDK-8301207](https://bugs.openjdk.org/browse/JDK-8301207): (jdeps) Deprecate jdeps -profile option

- src/jdk.jfr/share/man/jfr.1

Formatting changes.

- src/jdk.jshell/share/man/jshell.1

 [JDK-8308988](https://bugs.openjdk.org/browse/JDK-8308988): Update JShell manpage to include TOOLING description

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Commit messages:
 - 8300937: Update nroff pages in JDK 21 before RC

Changes: https://git.openjdk.org/jdk21/pull/151/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=151&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300937
  Stats: 163 lines in 28 files changed: 37 ins; 60 del; 66 mod
  Patch: https://git.openjdk.org/jdk21/pull/151.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/151/head:pull/151

PR: https://git.openjdk.org/jdk21/pull/151