Traceability update for trunk/ with Stable Tag 2.5.10.

Delta version 2.5.11d3.
Before sorting constants in settings.php by version number (@since tag).
The next commit is dedicated to moving constants and their docblocks in settings.php.
This replaces most of the list items in the file level docblock.
Moving blocks of code breaks traceability of changes, so it’s usually avoided.
WordPress plugins are supposed to maintain traceability in the SVN repo, which implies keeping changesets meaningful.

git-svn-id: https://plugins.svn.wordpress.org/footnotes/trunk@2496275 b8457f37-d9ea-0310-8a92-e5e31aec5664

class/dashboard/subpage-main.php

@@ -978,12 +978,23 @@ class MCI_Footnotes_Layout_Settings extends MCI_Footnotes_Layout_Engine {
 	 * Displays all settings for the backlink symbol.
 	 *
 	 * @since 1.5.0
+	 * 
+	 * - Update: **symbol for backlinks** removed; hyperlink moved to the reference number.
+	 * 
+	 * @since 2.0.0
+	 * The former 'hyperlink arrow' is incompatible with combined identical footnotes.
 	 *
-	 * Edited heading for v2.0.4
-	 *
-	 * The former 'hyperlink arrow', incompatible with combined identical footnotes,
-	 * became 'prepended arrow' in v2.0.3 after a user complaint about missing backlinking semantics
-	 * of the footnote number.
+	 * - Update: Reference container: clarify backlink semantics by prepended transitional up arrow, thanks to @mmallett issue report.
+	 * 
+	 * @since 2.0.3
+	 * 
+	 * - Update: Restore arrow settings to customize or disable the now prepended arrow symbol, thanks to @mmallett issue report.
+	 * 
+	 * @since 2.0.4
+	 * @date 2020-11-02T2115+0100
+	 * 
+	 * @reporter @mmallett
+	 * @link https://wordpress.org/support/topic/mouse-over-broken/#post-13593037
 	 *
 	 * @since 2.1.4  moved to Settings > Reference container > Display a backlink symbol
 	 * @since 2.2.1 and 2.2.4  back here