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

[Antón Seoane Ampudia]

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.

Marked as reviewed by anton-seoane at github.com (no known OpenJDK username).

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PR Review: https://git.openjdk.org/jdk/pull/27818#pullrequestreview-3340336705