Bug in documentation?

[Phillip Shelton <shelton usq edu au>]

Should the two sets of quotes in this section from
 http://www.gnome.org/projects/gnumeric/doc/cell-referencing.html 
be different?
That is "Sheet 0" in the text but 'Sheet 0' in the example.
<quote>
Referencing cells on other sheets
It is possible to reference cells which are not part of the current sheet.
This is done using the NAME!CELL syntax, where NAME is an identifier
(usually a sheet name) and CELL is a regular cell reference as described in
the previous sections.
Note that if NAME contains spaces, you need to quote the whole name to allow
Gnumeric to group the separate words in NAME as single name. For example,
you should use "Sheet 0" when referencing the default created "Sheet 0".

Example 12. Referencing values in other sheets
 ='Sheet 0'!A1+'Sheet 3'!A5   =SUM('Sheet 1'!A1:'Sheet 1'!A5)           

</quote>