Update cheatsheets

tldr/windows/reg

@@ -13,7 +13,27 @@ source: https://github.com/tldr-pages/tldr.git
 
 `reg {{command}}`
 
-- Display general information and list all available commands:
+- View documentation for adding and copying subkeys:
+
+`tldr reg {{add|copy}}`
+
+- View documentation for deleting keys and subkeys:
+
+`tldr reg {{delete|unload}}`
+
+- View documentation for searching, viewing, and comparing keys:
+
+`tldr reg {{compare|flags|query}}`
+
+- View documentation for exporting and importing registry keys not preserving the key ownerships and ACLs:
+
+`tldr reg {{export|import}}`
+
+- View documentation for saving, restoring registry and unloading keys preserving the key ownerships and ACLs:
+
+`tldr reg {{save|restore|load|unload}}`
+
+- Display help:
 
 `reg /?`