Fix typo in bool.mdx (#1106)

Author: fongandrew

src/routes/reference/jsx-attributes/bool.mdx

@@ -20,7 +20,7 @@ This attribute is most useful for Web Components.
 
 ```
 
-<Callout type="info" title="Strong-Typing Custom Bollean Attributes">
+<Callout type="info" title="Strong-Typing Custom Boolean Attributes">
 	Type definitions are required when using TypeScript.
 	See the [TypeScript](/configuration/typescript#forcing-properties-and-custom-attributes) page for examples.
 </Callout>