fix title

Author: VanMSFT

docs/machine-learning/toc.yml

@@ -380,7 +380,7 @@ items:
       items:
       - name: Package overview
         href: ../machine-learning/python/ref-py-microsoftml.md
-      - name: microsoftml Learners Objects
+      - name: Learners Objects
         href: ../machine-learning/python/reference/microsoftml/learners-object.md
       - name: adadelta_optimizer
         href: ../machine-learning/python/reference/microsoftml/adadelta-optimizer.md