Improve text about bananas

[cthoyt]

originally from #871

Also this text is confusing:

The legacy MIRIAM standard for generating CURIEs with this resource annotates the namespaceEmbeddedInLUI as true. This means that you may see local unique identifiers that include a redundant prefix and delimiter (also known as a banana) and therefore look like a CURIE. For Gene Ontology, the banana looks like GO:. Therefore, you may see local unique identifiers for this resource that look like GO:0032571 (instead of the canonical form 0032571) and CURIEs for this resource that look like go:GO:0032571 (instead of the canonical form go:0032571). The Bioregistry will automatically strip off the banana when standardizing local unique identifiers and CURIEs.

I don't know what "banana looks like GO:. " means. and of course "instead of the canonical form go:0032571" is not correct