Clarify documentation of AlgoliaException’s status code

Refs #77.

Author: Clément Le Provost

algoliasearch/src/main/java/com/algolia/search/saas/AlgoliaException.java

@@ -48,6 +48,13 @@ public AlgoliaException(String message, int statusCode)
 
     private static final long serialVersionUID = 1L;
 
+    /**
+     * Get the error's HTTP status code (if any).
+     * Only valid when the exception is an application-level error. Values are documented in the
+     * <a href="https://www.algolia.com/doc/rest">REST API</a>.
+     *
+     * @return The HTTP status code, or 0 if not available.
+     */
     public int getStatusCode()
     {
         return statusCode;