RFR: 8369573: Add missing compile commands help documentation for the signature part of method patterns

[Roberto Castañeda Lozano]

On Wed, 15 Oct 2025 08:17:46 GMT, Daniel Lundén <dlunden at openjdk.org> wrote:

> The documentation of the signature part of method patterns in `java -XX:CompileCommand=help` is missing. We should add it.
> 
> ### Changeset
> - Improve the documentation of signatures in `java -XX:CompileCommand=help`.
> 
> ### Testing
> 
> - [GitHub Actions](https://github.com/dlunde/jdk/actions/runs/18500483034)
> - `tier1` and HotSpot parts of `tier2` and `tier3` (and additional Oracle-internal testing) on Windows x64, Linux x64, Linux aarch64, macOS x64, and macOS aarch64.

Thanks for doing this, Daniel! Would it be possible to use the more precise term "method descriptor" instead of "signature" in the help message?

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PR Comment: https://git.openjdk.org/jdk/pull/27818#issuecomment-3406383884