Addressed requested changes for PR #40838

Addressed requested changes for PR #40838

* Fixed spelling ToSocketAddr -> ToSocketAddrs in module docs
  (which also fixes a link)
* Added missing "when" before "interacting" in module docs
* Changed SocketAddr's top-level docs to explicitly state what socket
  addresses consist of, making them more consistent with SocketAddrV4's
  and SocketAddrV6's docs
* Changed "in C" -> "in C's `netinet/in.h`"
* Changed wording in is_ipv4/is_ipv6 methods to ", `false` otherwise"
* Add missing closing ` ``` ` in Ipv6Addr's examples
* Removed "Errors" section in ToSocketAddrs' to_socket_addrs method as it
  was rather redundant