Update scripts/core/EXP-LAUNCH-ATTRIBUTES.rst

remove monospace for ${X} usage.

Co-authored-by: Kenneth Benzie (Benie) <k.benzie83@gmail.com>

Author: JackAKirk

scripts/core/EXP-LAUNCH-ATTRIBUTES.rst

@@ -84,7 +84,7 @@ Support
 --------------------------------------------------------------------------------
 
 Adapters which support this experimental feature *must* return the valid string
-defined in ``${X}_LAUNCH_PROPERTIES_EXTENSION_STRING_EXP`` as one of the options from
+defined in ${X}_LAUNCH_PROPERTIES_EXTENSION_STRING_EXP as one of the options from
 ${x}DeviceGetInfo when querying for ${X}_DEVICE_INFO_EXTENSIONS.
 
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