message: Add `Documentation` to custom Robot keywords
diff: @@ -11,6 +11,7 @@ ${UART} sysbus.cpu.uartSemihosting
  *** Keywords ***
  Prepare Tests
  + [Documentation] Make environment variables avaiable in whole test suite and list files in ${BIN_DIR}
  Setup
  ${SCRIPT} = Get Environment Variable SCRIPT
  ${LOGFILE} = Get Environment Variable LOGFILE
  @@ -21,10 +22,12 @@ Prepare Tests
  List All Test Binaries
  Teardown With Custom Message
  + [Documentation] Replace robot fail message with shorter one to avoid duplicated UART output in log
  Set Test Message ${file} - FAILED
  Test Teardown
  List All Test Binaries
  + [Documentation] List all files in ${BIN_DIR} and make it available from test cases
  Setup
  ${BIN_DIR} = Get Environment Variable BIN_DIR
  @{binaries} = List Files In Directory ${BIN_DIR} absolute=True
  