Currently, in a JIRA ticket that has Issue Links - the default is to show the first 5 links followed by a "Show x more links..." which will expand the Issue Links display to show all links.
And a "Wiki Page" is always shown under "Show x more links..."

Example:

A Jira system administrator can define the order in which linked issues are displayed in the Issue Links section on the 'view issue' page by editing the value of the jira.view.issue.links.sort.order property on Jira's Advanced settings page.

However, the "jira.view.issue.links.sort.order" property can only accept the following individual field values: 'key', 'type', 'status', 'priority' and 'resolution'.

It would be nice if there was an option that could be chosen to show "wiki pages" on the top of the list.