add keyboard shortcuts to the api, remove best practices section

packages/extension-bullet-list/index.ts

@@ -25,7 +25,7 @@ export default new Node()
     },
   }))
   .keys(({ editor }) => ({
-    'Shift-Ctrl-8': () => editor.bulletList(),
+    'Shift-Control-8': () => editor.bulletList(),
   }))
   .inputRules(({ type }) => [
     wrappingInputRule(/^\s*([-+*])\s$/, type),

packages/extension-code-block/index.ts

@@ -29,7 +29,7 @@ export default new Node()
     },
   }))
   .keys(({ editor }) => ({
-    'Shift-Ctrl-\\': () => editor.codeBlock(),
+    'Shift-Control-\\': () => editor.codeBlock(),
   }))
   .inputRules(({ type }) => [
     textblockTypeInputRule(/^```$/, type),

packages/extension-ordered-list/index.ts

@@ -38,7 +38,7 @@ export default new Node()
     },
   }))
   .keys(({ editor }) => ({
-    'Shift-Ctrl-9': () => editor.orderedList(),
+    'Shift-Control-9': () => editor.orderedList(),
   }))
   .inputRules(({ type }) => [
     wrappingInputRule(