Merge pull request #9752 from antedeguemon/antedeguemon-fix-elixir-paths

docs: Fix path for Elixir tests

Author: rosieyohannan

docs/guides/modules/optimize/pages/use-the-circleci-cli-to-split-tests.adoc

@@ -317,7 +317,7 @@ jobs:
       - run:
           name: Run tests
           command: |
-            circleci tests glob 'lib/**/*_test.exs'
+            circleci tests glob 'test/**/*_test.exs'
             | circleci tests run --command='xargs -n1 echo > test_file_paths.txt'
 
             mix ecto.setup --quiet

docs/guides/modules/test/pages/rerun-failed-tests.adoc

@@ -242,7 +242,7 @@ Ensure you are using `xargs` in your `circleci tests run` command to pass the li
 - run:
     name: Run tests
     command: |
-      circleci tests glob 'lib/**/*_test.exs'
+      circleci tests glob 'test/**/*_test.exs'
       | circleci tests run --command='xargs -n1 echo > test_file_paths.txt'
 
       mix ecto.setup --quiet