Actually that FileConnection javadoc on blackberry's site should be current. This is because FileConnection is part of JSR 75 and JSR 75 only had one version, 1.00. This JSR is not owned by Oracle hence you don't see it's javadoc online on Oracle's site. However as for any JSR you can download it here https://jcp.org/en/jsr/detail?id=75
One more comment: GCF as it stands from it's name is a Framework. It outlines the principles of organizing the Generic access to the Connections as well as provides some of the particular protocols. But that's not the end - it's designed that other parts of Java stack would plug in protocols providing specific functionality. And actually there are such parts out there. For example JSR75 FileConnection or JSR82 Bluetooth
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Just noting that there is actually a link to the FileConnection spec in the "Supporting Materials" section of the week 3 page This is the same one which Andrey pointed to.