fix EOL in string error

Error when running a DaVinci job introduced in !619 (merged) :

    "E.g. for a local DB:\n./run davinci [command] --inputfiledb Upgrade_Bd2KstarMuMu_ldst\n 
                                                                                             ^
SyntaxError: EOL while scanning string literal```

changed the description

assigned to @erodrigu and @pkoppenb

Thanks @cprouve, seems my eyes "glitched". In fact it would be even better to use a multi-line string with """ but we can leave that to clean-ups and improvements next year. Let me merge to avoid somebody getting troubles with the nightlies. (Sorry for the issue.)

approved this merge request

merged

mentioned in commit 14318773

mentioned in merge request !639 (merged)