update stable-docs plugins.md (#5869)
update stable-docs plugins.md (#5869)

- Java  plugin link (in Jhipster org now)
- Added TOML plugin to stable docs (already in the regular docs).
existentialism/prettier,existentialism/prettier,rattrayalex/prettier,jlongster/prettier,prettier/prettier,existentialism/prettier,prettier/prettier,rattrayalex/prettier,existentialism/prettier,prettier/prettier,prettier/prettier,rattrayalex/prettier