When working with enabling proxy support for a project, we were trying to ensure we documented which versions were needed for features correctly and found that there are conflicts over when features were introduced on these two pages:
Under CURLOPT_PROXYTYPE in the setopt doc, it says that CURLPROXY_SOCKS4 was introduced in 7.15.2, whereas the symbols page reports 7.10. Since archived source bundles are difficult to come by, I can't confirm when it became available. Though I happened to have recently compiled software with socks support on a system running 7.15.1, so I know 7.15.2 is inaccurate.
Additionally, the setopt doc reports that CURLOPT_SOCKOPTFUNCTION was introduced in 7.15.6, but the symbols page says 7.16.
There may be other conflicts on the pages, but these are the ones we came across.