minor changes in docstrings
minor changes in docstrings

lino-framework/lino,lsaffre/lino,khchine5/lino,khchine5/lino,lsaffre/lino,lino-framework/lino,lino-framework/lino,lino-framework/lino,lino-framework/lino,lsaffre/lino,khchine5/lino,khchine5/lino,lsaffre/lino,khchine5/lino,lsaffre/lino