Fixed typo and missing part of "Where to go next" (#1151)

Author: vfdev-5

docs/source/concepts.rst

@@ -426,6 +426,4 @@ or can be used as stand-alone objects:
 Complete list of metrics and the API can be found in :doc:`metrics` module.
 
 
-
-
-**Where to go next?** ?????.
+**Where to go next?** Checkout our :doc:`examples` and tutorial notebooks.

docs/source/examples.rst

@@ -58,7 +58,7 @@ Notebooks
 - `MNIST training on a single TPU <https://github.com/pytorch/ignite/blob/master/examples/notebooks/MNIST_on_TPU.ipynb>`_
 
 
-All notebooks can be opened in Google Colab with a link:
+All notebooks can be opened on Google Colab with a link:
 
 .. code-block:: text