[help-texinfo] Using @image with @value gives an error

[Christopher Dimech]

I have noticed that the following commands works well

@center @image{../umrq3--files/E--ExecSm/309E--a01,11cm,,,.png}


However the following one gives an error

@set upath ../umrq3--files/E--ExecSm
@center @image{@value{upath}/309E--a01,11cm,,,.png}