device_selection.rst: Update of TF user guide links to conform to new Poplar API structure

Summary: Applies to TF1 and TF2. Fixing user guide links to conform ot new Poplar API structure.

Reviewers: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, jamiep, markf

Reviewed By: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, jamiep, markf

Subscribers: markf

Maniphest Tasks: T47189

Differential Revision: https://phabricator.sourcevertex.net/D53030

Author: jayniep-gc

tensorflow/compiler/plugin/poplar/docs/device_selection.rst

@@ -415,7 +415,7 @@ Runtime errors
 
 These errors and exceptions occur when running a Poplar program. The full list
 of all the exceptions and their meanings can be found in the Poplar
-documentation in the `Exceptions <https://docs.graphcore.ai/projects/poplar-api/en/latest/poplar_api.html#exceptions>`__
+documentation in the `Exceptions <https://docs.graphcore.ai/projects/poplar-api/page/poplar/execution/exceptions.html>`__
 section of the Poplar API reference manual.
 
 These runtime errors are handled in the following manner: