[Doc] staj_event link in document is broken

[mapleFU]

Describe the proposed feature

Hi, thanks for the jsoncons library!

I'm learning the doc of staj parser of jsoncons, I found in https://github.com/danielaparker/jsoncons/blob/cdf93ad76679c3dfbd8a926956a0628d8432219a/doc/Reference.md the link is broken. And in fact here it only have document for staj_event_type.

Should we add of remove the part?

[danielaparker]

Thanks for pointing that out! I fixed the link on master.

[mapleFU]

Thanks!