fix broken links

docs/src/docPages/api/commands.md

@@ -91,7 +91,7 @@ Both calls would return `true` if it’s possible to apply the commands, and `fa
 
 In order to make that work with your custom commands, don’t forget to return `true` or `false`.
 
-For some of your own commands, you probably want to work with the raw [transaction](/api/concept). To make them work with `.can()` you should check if the transaction should be dispatched. Here is how you can create a simple `.insertText()` command:
+For some of your own commands, you probably want to work with the raw [transaction](/api/introduction). To make them work with `.can()` you should check if the transaction should be dispatched. Here is how you can create a simple `.insertText()` command:
 
 ```js
 export default (value) => ({ tr, dispatch }) => {

docs/static/_redirects

@@ -1,4 +1,4 @@
 /overview             /
 /examples             /examples/default
 /guide                /guide/configuration
-/api                  /api/concept
+/api                  /api/introduction