Using PGAL10 promoter to overexpress specific yeast genes: How to?
You're right about them being promoters, although it would be useful if you posted the link to the source of the sentence that you cite, so that we can read exactly how they are being used.

A fairly common way to study genes that aren't consistently highly expressed is to place them under the control of a strong promoter; that is, a promoter that is recognized by transcription factors in such a way that its linked gene is almost always expressed. 

This is exactly what this group did in this paper, to study some features of yeast metabolism. In this case, the genes that they were interested in studying were cloned into a vector that was then inserted into yeast cells that lacked that gene. This way, the researchers knew that any expression of their gene of interest came from the vector and was driven by the pGAL1 promoter. 

Similarly, if ERG10 was your gene of interest, this might be a strategy that you could adopt to study it.