Docs: Fix the syntax for the get_previous_post_link() DocBlock to ensure it's read and parsed as such instead of as a multi-line comment.

See #32246.


git-svn-id: https://develop.svn.wordpress.org/trunk@36011 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/link-template.php

@@ -1887,7 +1887,7 @@ function get_boundary_post( $in_same_term = false, $excluded_terms = '', $start
 	return get_posts( $query_args );
 }
 
-/*
+/**
  * Get previous post link that is adjacent to the current post.
  *
  * @since 3.7.0