tour: [link redirect to localhost instead of blog]

[x12311231]

Context: http://127.0.0.1:3999/tour/moretypes/15

link redirect to localhost(http://127.0.0.1:3999/tour/welcome/1) instead of blog:(To learn more about slices, read the Slices: usage and internals article.)

[crisman]

Fix available in golang/website#213

[gabrc52]

There are several such links, e.g. http://127.0.0.1:3999/tour/moretypes/23 has http://127.0.0.1:3999/pkg/strings/#Fields