Update next.md

ci/release/changelogs/next.md

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+D2 v0.6 introduces variable substitutions. The only major language feature left that were in the intial language design is globs, then we'll stamp it 1.0!
+
+Layout capability also takes a subtle but important step forward: you can now customize the position of labels and icons.
+
 #### Features 🚀
 
 - Variables and substitutions are implemented. See [docs](https://d2lang.com/tour/vars). [#1473](https://github.com/terrastruct/d2/pull/1473)
 - Configure timeout value with D2_TIMEOUT env var [#1392](https://github.com/terrastruct/d2/pull/1392)
 - Scale renders and disable fit to screen with `--scale` flag [#1413](https://github.com/terrastruct/d2/pull/1413)
-- `null` keyword can be used to un-declare. See [docs](https://d2lang.com/tour/TODO) [#1446](https://github.com/terrastruct/d2/pull/1446)
+- `null` keyword can be used to un-declare. See [docs](https://d2lang.com/tour/overrides#null) [#1446](https://github.com/terrastruct/d2/pull/1446)
 
 #### Improvements 🧹
 
@@ -13,7 +17,7 @@
 - Improved rendering and text measurement for code shapes [#1425](https://github.com/terrastruct/d2/pull/1425)
 - The autoformatter moves board declarations to the bottom of its scope [#1424](https://github.com/terrastruct/d2/pull/1424)
 - All font styles in sketch mode use a consistent font-family [#1463](https://github.com/terrastruct/d2/pull/1463)
-- Tooltip and link icons are now positioned on shape border [#1466](https://github.com/terrastruct/d2/pull/1466)
+- Tooltip and link icons are positioned on shape border [#1466](https://github.com/terrastruct/d2/pull/1466)
 - Tooltip and link icons are always rendered over shapes [#1467](https://github.com/terrastruct/d2/pull/1467)
 - Boards with no objects are considered folders [#1504](https://github.com/terrastruct/d2/pull/1504)
 - `DEBUG` environment variable ignored if set incorrectly [#1505](https://github.com/terrastruct/d2/pull/1505)