Add user Walkthrough section, set line height to 1.5

Author: rojvv

src/_includes/style/content.scss

@@ -2,7 +2,7 @@
   min-width: 0;
   color: var(--fg);
   font-size: 16px;
-  line-height: 1.65;
+  line-height: 1.5;
 
   > h1 {
     margin: 1rem 0;
@@ -75,7 +75,7 @@
   p,
   ol,
   ul {
-    line-height: 1.65;
+    line-height: 1.5;
   }
 
   b,

src/message-drafts.md

@@ -0,0 +1,27 @@
+---
+title: Message Drafts
+parent: /#walkthrough
+walkthrough:
+  track: user
+  order: 17
+---
+
+User clients can save message drafts and clear all drafts.
+
+## Saving a Draft
+
+Use {{ "saveDraft" |> m }} with a chat's identifier and the draft text.
+
+```ts
+await client.saveDraft(chatId, "Remember to send the report.");
+```
+
+Use {{ "saveRichTextDraft" |> m }} to save a rich text draft.
+
+## Clearing Drafts
+
+Use {{ "clearDrafts" |> m }} to clear all message drafts.
+
+```ts
+await client.clearDrafts();
+```