YARN-8577. Fix the broken anchor in SLS site-doc. Contributed by Weiwei Yang.

(cherry picked from commit 3d3158cea4580eb2e3b2af635c3a7d30f4dbb873)

hadoop-tools/hadoop-sls/src/site/markdown/SchedulerLoadSimulator.md

@@ -27,7 +27,7 @@ YARN Scheduler Load Simulator (SLS)
     * [Metrics](#Metrics)
         * [Real-time Tracking](#Real-time_Tracking)
         * [Offline Analysis](#Offline_Analysis)
-    * [Synthetic Load Generator](#SynthGen)
+    * [Synthetic Load Generator](#Synthetic_Load_Generator)
     * [Appendix](#Appendix)
         * [Resources](#Resources)
         * [SLS JSON input file format](#SLS_JSON_input_file_format)