psr 19. current uri standard 3986 instead of obsoleted 2396 DRAFT standard

[Google user]

the description of @see and @link tags in the phpdoc tags psr refers to the rfc 2396:

The URI MUST be complete and well-formed as specified in RFC 2396.
https://github.com/php-fig/fig-standards/blob/master/proposed/phpdoc-tags.md#description-5
https://github.com/php-fig/fig-standards/blob/master/proposed/phpdoc-tags.md#description-11

this rfc is of year 1998 and is a DRAFT standard that itself confirms that it's been obsoleted by the newer rfc

Obsoleted by: 3986                                        DRAFT STANDARD
https://tools.ietf.org/html/rfc2396

the rfc 3986 is of 2005 year and pretends to have an INTERNET STANDARD status:

Updated by: 6874, 7320                                 INTERNET STANDARD
Obsoletes: 2732, 2396, 1808                                  L. Masinter
https://tools.ietf.org/html/rfc3986

definitely, the psr has to refer to the newer one, not to the obsolete

[Alessandro Lai]

Thanks for spotting this. Since it seems a straightforward edit, feel free to send a PR to the appropriate documento on GitHub!