Make sandbox mode into link, remove outdated feature

Changes-to-original-game.md

@@ -24,7 +24,7 @@
 * Mountain tool available in game.
 * Restored stand-alone Research and Development window.
 * SC4 files can now also be opened as well as SV4 files in the scenario editor.
-  * Command line interface available: ```openrct2 edit ./forest_frontiers.sc4```
+  * Command line interface available: `openrct2 edit ./forest_frontiers.sc4`
 * OpenRCT2 allows switching to every vehicle that uses the same track (e.g. switching from Cheshire Cats to Vintage Cars is now possible again).
 * The "Have fun" objective can now be selected in the scenario editor.
 * Enable traffic light UI via themes.
@@ -41,7 +41,7 @@
 ## New features
 * Game configuration, cache, scores and screenshots now saved in user documents directory under OpenRCT2.
 * [[Cheats]] (<kbd>Ctrl-Alt-C</kbd> for Windows and Linux, <kbd>Cmd-Ctrl-C</kbd> for macOS).
-  * Sandbox mode (edit park boundary).
+  * [[Sandbox mode]] (edit park boundary).
   * Toggle support limits (build at any height).
   * Toggle disable clearance checks (place things in the same location as other things a.k.a zero clearance).
 * Screenshot format is now PNG and file names now contain the park name.
@@ -61,7 +61,6 @@
 * Custom title sequences (+ editor window).
 * Uncapped frame rate (extra draw frames between game ticks will be used to interpolate sprite movement for smoother look).
 * Hardware display (graphics routed through GPU to enable steam overlay and more compatible video capture).
-* Allow testing of incomplete tracks (non-blocked modes only).
 * Increased limits for maximum of circuits per roller coaster to 20 and people on mazes to 64.
 * Clear scenery now has toggles for paths, small and large scenery.
 * Day / night cycle (enable in options).
@@ -78,11 +77,11 @@
 * Option for early scenario completion.
 
 ## Localisation
-* UTF-8 support
-* TTF font support, for CJK, Arabic and other non-Latin scripts
+* UTF-8 support.
+* TTF font support, for CJK, Arabic and other non-Latin scripts.
 * The RCT2 sprite font has been extended with characters for Norwegian, Danish, Catalan, Romanian, Turkish and Russian.
 * Improvements to original translations (including those stored in objects and scenarios)
-* Many additional translations
+* Many additional translations.
 * Ability to change language via the options window.
 * Languages stored as txt files in `./data/languages`
 * Ability to show day after month (US format) and to show the year first (Asian format)