Fix documentation \DeclarePrintbibliographyDefaults' argument

doc/latex/biblatex/biblatex.tex

@@ -3751,7 +3751,7 @@ \subsubsection{The Bibliography}
 
 This command prints a bibliography heading defined with \cmd{defbibheading}. It takes one optional argument, which is a list of options given in \keyval notation. The options are a small subset of those supported by \cmd{printbibliography}. Valid options are \opt{heading} and \opt{title}. By default, this command uses the heading \texttt{bibliography}. See \secref{use:bib:hdg} for details. Also see \secref{use:use:mlt,use:use:div} for usage examples.
 
-\cmditem{DeclarePrintbibliographyDefaults}[key=value, \dots]
+\cmditem{DeclarePrintbibliographyDefaults}{key=value, \dots}
 
 This command can be used to globally set defaults for some options to \cmd{printbibliography}, the \cmd{bibby...} bibliography commands and \cmd{printbibheading}.
 The supported keys are