Update help links from Search to ensure they are correct

Summary

If a search in Bitbucket server contains no results a page is showed containing a link to learn more about our advanced features.

Problem

The link points to a non-existing page.

Case one:

Some of the help links in Bitbucket Search point to "go.atlassian.com" short links, these should be replaced with proper documentation links.

Case two:

One link points to http://docs.atlassian.com/bitbucketserver/docs-048/help.search.guide?utm_campaign=in-app-help&utm_medium=in-app-help&utm_source=stash
and when followed gives a Page Not Found result:

Suggested Resolution

These links should be replaced with proper documentation links.

In addition, help links should be double checked to ensure they are relevant and correct.