fix(openseadragon): correct Options.initialPage type (#45068)
fix(openseadragon): correct Options.initialPage type (#45068)

* fix(openseadragon): correct Options.initialPage type

* Update types/openseadragon/index.d.ts

Add jsdoc to `initialPage`

Co-authored-by: Piotr Błażejewicz (Peter Blazejewicz) <d6ea1856063085eb588d69ac7ca53e4484c60f1f@users.noreply.github.com>
dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped