Fix typo in regular expression in docs

[mccalluc]

^ matches the start of the line or string, so it shouldn't be in the middle. Suspect this was copy-and-pasted from https://ror.readme.io/docs/ror-identifier-pattern.

[amandafrench]

Thanks SO much for going to the trouble to create this pull request, @mccalluc Great catch. I've updated the page and have just removed the regex, since there's no need for it to be on the FAQs: https://ror.org/about/faqs/#using-and-integrating-ror