fix error

Author: gschatz-splunk

synthetics/test-config/test-config.rst

@@ -70,7 +70,9 @@ Use variables to fill in fields, provide URLs, and enter other information durin
    * - Global variables 
      - Pre-saved, reusable variables you can define once and use across all your Browser and API tests. See :ref:`global-variables` to learn more. 
 
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         * - Custom variables
           - Custom variables are local to a test, and their values can change over the course of a test. Use them to store a value of interest created in a step, to be consumed in another step downstream in a single test.