Hyperlink "nonconfigurable"-tagged attributes to Bazel's
configurable attributes documentation.

PiperOrigin-RevId: 152188409
diff --git a/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java b/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java
index b655284..aec9eb1 100644
--- a/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java
+++ b/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java
@@ -182,7 +182,10 @@
     StringBuilder sb = new StringBuilder()
         .append(TYPE_DESC.get(attribute.getType()))
         .append("; " + (attribute.isMandatory() ? "required" : "optional"))
-        .append(!attribute.isConfigurable() ? "; nonconfigurable" : "")
+        .append(!attribute.isConfigurable()
+            ? String.format("; <a href=\"%s#configurable-attributes\">nonconfigurable</a>",
+                RuleDocumentation.COMMON_DEFINITIONS_PAGE)
+            : "")
         .append(getDefaultValue());
     return sb.toString();
   }