Remove doc comment about dateusetime for comp dates (#909,#863)

doc/latex/biblatex/biblatex.tex

@@ -2446,7 +2446,7 @@ \subsubsection{Preamble Options}
 
 \boolitem[false]{dateusetime}
 
-Specifies whether to print any time component of a date field after the date component. The separator between the date and time components is \cmd{bibdatetimesep} from \secref{use:fmt:lng}. This option does nothing if a compact date format is being used (see \secref{use:opt:pre:gen}) as this would be very confusing.
+Specifies whether to print any time component of a date field after the date component. The separator between the date and time components is \cmd{bibdatetimesep} from \secref{use:fmt:lng}.
 
 \boolitem[false]{labeldateusetime}