Merge pull request #4781 from nomind60s/ticket/15151
[ticket/15151] ACP Cookie settings add explanatory text
* github.com:phpbb/phpbb:
[ticket/15151] Use redirected link for consistency
[ticket/15151] ACP Cookie settings explanatory text
[ticket/15151] ACP Cookie settings add explanatory text where it was missing
[ticket/15151] Use redirected link for consistency
Other phpbb.com links used in the core use a redirect rather than a direct link
so change to make the Cookie settings link a redirect also.
[ticket/15151] ACP Cookie settings add explanatory text where it was missing
Improve the lead section to include a link to the phpBB.com Knowledge Base and
add explanation text for the Cookie domain, Cookie name and Cookie path fields.