New xpaths for Wright's cited volume and page range

[wlpotter]

Previously the volume and page numbers for the Wright entry were in a single citedRange element (additional/listBibl/bibl/citedRange[@unit="p"]. These are now split out into two citedRange elements:

• additional/listBibl/bibl/citedRange[@unit="vol"]
• additional/listBibl/bibl/citedRange[@unit="p"]

To replicate current display, the two values should be concatenated with a ":" in between. Example from https://bl.syriac.uk/ms/10: "1:101-108"