Enhance sorting issue lists doc

doc/user/project/issues/sorting_issue_lists.md

@@ -8,34 +8,59 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 
 You can sort a list of issues several ways, including by:
 
-- Blocking **(PREMIUM)**
-- Created date
-- Due date
-- Label priority
-- Last updated
-- Milestone due date
-- Popularity
-- Priority
-- Title ([introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/67234) in GitLab 14.3)
-- Weight
+- [Blocking issues](#sorting-by-blocking-issues)
+- [Created date](#sorting-by-created-date)
+- [Due date](#sorting-by-due-date)
+- [Label priority](#sorting-by-label-priority)
+- [Last updated](#sorting-by-last-updated)
+- [Manual sorting](#manual-sorting)
+- [Milestone due date](#sorting-by-milestone-due-date)
+- [Popularity](#sorting-by-popularity)
+- [Priority](#sorting-by-priority)
+- [Title](#sorting-by-title)
+- [Weight](#sorting-by-weight)
 
 The available sorting options can change based on the context of the list.
-For sorting by issue priority, see [Label Priority](../labels.md#label-priority).
 
-In group and project issue lists, it is also possible to order issues manually,
-similar to [issue boards](../issue_board.md#ordering-issues-in-a-list).
+## Sorting by blocking issues **(PREMIUM)**
 
-## Sorting by popularity
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/34247/) in GitLab 13.7.
 
-When you select sorting by **Popularity**, the issue order changes to sort descending by the
-number of upvotes ([awarded](../../award_emojis.md) "thumbs up" emoji)
-on each issue. You can use this to identify issues that are in high demand.
+When you sort by **Blocking**, the issue list changes to sort descending by the
+number of issues each issue is blocking.
+
+## Sorting by created date
+
+When you sort by **Created date**, the issue list changes to sort descending by the issue
+creation date. Issues created most recently are first.
+
+## Sorting by due date
+
+When you sort by **Due date**, the issue list changes to sort ascending by the issue
+[due date](issue_data_and_actions.md#due-date). Issues with the earliest due date are first,
+and issues without a due date are last.
+
+## Sorting by label priority
+
+When you sort by **Label priority**, the issue list changes to sort descending.
+Issues with the highest priority label are first, then all other issues.
+
+Ties are broken arbitrarily. Only the highest prioritized label is checked,
+and labels with a lower priority are ignored.
+For more information, see [issue 14523](https://gitlab.com/gitlab-org/gitlab/-/issues/14523).
+
+To learn more about priority labels, read the [Labels](../labels.md#label-priority) documentation.
+
+## Sorting by last updated
+
+When you sort by **Last updated**, the issue list changes to sort by the time of a last
+update. Issues changed the most recently are first.
 
 ## Manual sorting
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/62178) in GitLab 12.2.
 
-When you select **Manual** sorting, you can change
+When you sort by **Manual** order, you can change
 the order by dragging and dropping the issues. The changed order persists, and
 everyone who visits the same list sees the updated issue order, with some exceptions.
 
@@ -50,11 +75,45 @@ this ordering is maintained whenever they appear together in any list.
 
 This ordering also affects [issue boards](../issue_board.md#ordering-issues-in-a-list).
 Changing the order in an issue list changes the ordering in an issue board,
-and vice versa.
+and the other way around.
 
-## Sorting by blocking issues **(PREMIUM)**
+## Sorting by milestone due date
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/34247/) in GitLab 13.7.
+When you sort by **Milestone due date**, the issue list changes to sort ascending by the
+assigned milestone due date. Issues with milestones with the earliest due date are first,
+then issues with a milestone without a due date.
+
+## Sorting by popularity
+
+When you sort by **Popularity**, the issue order changes to sort descending by the
+number of upvotes ([awarded](../../award_emojis.md) a "thumbs up" emoji)
+on each issue. You can use this to identify issues that are in high demand.
+
+## Sorting by priority
+
+When you sort by **Priority**, the issue order changes to sort in this order:
+
+1. Issues with milestones that have due dates, where the soonest assigned milestone is listed first.
+1. Issues with milestones with no due dates.
+1. Issues with a higher priority label.
+1. Issues without a prioritized label.
+
+To learn more about priority, read the [Labels](../labels.md#label-priority) documentation.
+
+## Sorting by title
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/67234) in GitLab 14.3.
+
+When you sort by **Title**, the issue order changes to sort alphabetically by the issue
+title in this order:
+
+- Emoji
+- Special characters
+- Numbers
+- Letters: first Latin, then accented (for example, `ö`)
+
+## Sorting by weight
 
-When you select to sort by **Blocking**, the issue list changes to sort descending by the
-number of issues each issue is blocking. You can use this to determine the critical path for your backlog.
+When you sort by **Weight**, the issue list changes to sort ascending by the
+[issue weight](issue_weight.md).
+Issues with lowest weight are first, and issues without a weight are last.