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minor wording change about string.

\label{Spreadsheet_HowTo}

\textbf{Summing up columns}

To take the sum of column M, for example, use \texttt{\&SUM(`M*')}\index{SUM}

\noindent
\textbf{Spreadsheet Lists}

When you have a list of numbers in a cell, how it is displayed depends
on how you separate the numbers and how Perl interprets the results.

\texttt{35 45 12} will not generate any result because this is an
invalid Perl statement.

\texttt{35,45,12} will have a result of 12 because Perl has a comma
operator similar to the comma operator\index{comma operator} in C.

The comma operator is binary and returns the value on its right. Thus
\texttt{\$variable = 15, 26;} assigns \texttt{\$variable} the value
26.  If you need the values to all be displayed as a string, enclose the entire
cell contents in quote marks.