[java] Fix broken LICENSE link in java/README.md

[rinceyuan]

The License section of java/README.md links to sdk/LICENSE, which resolves to java/sdk/LICENSE — a path that does not exist. The link 404s on GitHub.

No java-local LICENSE has ever been tracked in this repository, so the link has been dead since it was introduced; the java/src → java/sdk restructure in #2301 only changed which nonexistent path it pointed at (LICENSE → sdk/LICENSE). This retargets it to the repository-root ../LICENSE.

Verification

The only LICENSE files tracked in the repo:

$ git ls-files | grep LICENSE
LICENSE
rust/LICENSE

java/LICENSE was never tracked, so the pre-restructure link was dead too:

$ git log --oneline --all -- java/LICENSE
                      # (no output)
$ git ls-tree d9a6fabb^ java/ --name-only | grep LICENSE
                      # (no output — java/LICENSE absent before the move as well)

Before / after, resolved relative to java/README.md:

Link target	Resolves to	Exists
sdk/LICENSE (before)	java/sdk/LICENSE	❌
../LICENSE (after)	LICENSE	✅

Scope

One line in one file. java/README.md is the only README that links to a LICENSE file — nodejs, go, and dotnet each render a bare MIT under ## License, and rust/python have no License section at all — so nothing else is affected.

[Copilot]

🟢 Approval recommended

The link-only change correctly targets the existing root license, with no unresolved issues.

Pull request overview

Fixes the broken license link in the Java README by pointing to the repository-root license.

Changes:

• Updates sdk/LICENSE to ../LICENSE.

File summaries

File	Description
java/README.md	Corrects the MIT license link.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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