fix links

Author: iliakan

2-ui/5-loading/01-onload-ondomcontentloaded/article.md

@@ -150,12 +150,12 @@ window.addEventListener("unload", function() {
 ```
 
 - The request is sent as POST.
-- We can send not only a string, but also forms and other formats, as described in the chapter <info:fetch-basics>, but usually it's a stringified object.
+- We can send not only a string, but also forms and other formats, as described in the chapter <info:fetch>, but usually it's a stringified object.
 - The data is limited by 64kb.
 
 When the `sendBeacon` request is finished, the browser probably has already left the document, so there's no way to get server response (which is usually empty for analytics).
 
-There's also a `keepalive` flag for doing such "after-page-left" requests in  [fetch](info:fetch-basics) method for generic network requests. You can find more information in the chapter <info:fetch-api>.
+There's also a `keepalive` flag for doing such "after-page-left" requests in  [fetch](info:fetch) method for generic network requests. You can find more information in the chapter <info:fetch-api>.
 
 
 If we want to cancel the transition to another page, we can't do it here. But we can use  another event -- `onbeforeunload`.

2-ui/99-ui-misc/01-mutation-observer/article.md

@@ -130,7 +130,7 @@ let hello = "world";
 
 Everything's simple so far, right? There are `<pre>` code snippets in HTML, we highlight them.
 
-Now let's go on. Let's say we're going to dynamically fetch materials from a server. We'll study methods for that [later in the tutorial](info:fetch-basics). For now it only matters that we fetch an HTML article from a webserver and display it on demand:
+Now let's go on. Let's say we're going to dynamically fetch materials from a server. We'll study methods for that [later in the tutorial](info:fetch). For now it only matters that we fetch an HTML article from a webserver and display it on demand:
 
 ```js
 let article = /* fetch new content from server */

4-binary/03-blob/article.md

@@ -233,7 +233,7 @@ While `ArrayBuffer`, `Uint8Array` and other `BufferSource` are "binary data", a
 
 That makes Blobs convenient for upload/download operations, that are so common in the browser.
 
-Methods that perform web-requests, such as [XMLHttpRequest](info:xmlhttprequest), [fetch](info:fetch-basics) and so on, can work with `Blob` natively, as well as with other binary types.
+Methods that perform web-requests, such as [XMLHttpRequest](info:xmlhttprequest), [fetch](info:fetch) and so on, can work with `Blob` natively, as well as with other binary types.
 
 We can easily convert betweeen `Blob` and low-level binary data types: