fix: formatting fix from review

Co-authored-by: Sarina Canelake <sarina@axim.org>

Author: rpenido

source/educators/references/course_development/exercise_tools/lti_component_settings.rst

@@ -83,7 +83,7 @@ LTI Component Settings
 
    * - Tool Public Key (LTI 1.3 only)
      - The LTI 1.3 tool's public key. This is a string that starts with
-       '-----BEGIN PUBLIC KEY-----' and is required so that the LMS can check if
+       ``-----BEGIN PUBLIC KEY-----`` and is required so that the LMS can check if
        the messages and launch requests received have the signature from the tool.
        This is not required when doing LTI 1.3 Launches without LTI Advantage.