fix: correct error message for binding embedded static resources in Bootstrapper

Author: mkjsix

core/src/main/java/org/restheart/Bootstrapper.java

@@ -849,7 +849,7 @@ private static void plugStaticResourcesHandlers(final Configuration conf) {
 
                 if (sr.embedded()) {
                     if (sr.what() == null || sr.what().startsWith("/")) {
-                        LOGGER.error("Cannot bind embedded static resources {}. parameter 'where'"
+                        LOGGER.error("Cannot bind embedded static resources {}. parameter 'what'"
                                 + "cannot start with /. the path is relative to the jar root dir"
                                 + " or classpath directory", sr);
                         return;