Add missing troubleshooting docs

Differential Revision: D63643251

Pull Request resolved: meta-pytorch#964

Author: jesszzzz

docs/source/index.rst

@@ -60,6 +60,7 @@ Documentation
       fb/cogwheel.rst
       fb/named_resources.rst
       fb/tracker.md
+      fb/troubleshooting.md
 
 
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