utils/doc: Rename get_rst_from_extension for consistency
utils/doc: Rename get_rst_from_extension for consistency

lisatn/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,lisatn/workload-automation,lisatn/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,setrofim/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,lisatn/workload-automation