Add metadata config options to Java configuration reference (#160)

Author: devalog

fern/products/sdks/overview/java/configuration.mdx

@@ -87,4 +87,33 @@ config:
 For example, if you have an alias `ResourceId: string` then if this is true, the
 generator will generate a `ResourceId.java` file. If false, it will just treat it
 as `java.util.String`.
+</ParamField>
+
+## Publishing metadata configuration options
+
+If you want to customize how your publishing metadata looks in your
+`build.gradle` file, update the `metadata` field in `generators.yml`.
+
+```yml {4-9}
+    generators:
+      - name: fernapi/fern-java-sdk
+        version: 2.7.0
+        metadata:
+          author: "AuthorName"
+          email: "[email protected]"
+          package-description: "Your site description here"
+          reference-url: "https://example.com"
+          license: "MIT"
+
+```
+
+<ParamField path="author" type="string" required={false} toc={true}>
+</ParamField>
+<ParamField path="email" type="string" required={false} toc={true}>
+</ParamField>
+<ParamField path="license" type="'MIT' | 'Apache-2.0' | { custom: 'Custom License Name' }" required={false} toc={true}>
+</ParamField>
+<ParamField path="package-description" type="string" required={false} toc={true}>
+</ParamField>
+<ParamField path="reference-url" type="string" required={false} toc={true}>
 </ParamField>