Update README.md

Fix little typo

README.md

@@ -13,7 +13,7 @@ The plugin uses [Asciidoctor.js](https://docs.asciidoctor.org/asciidoctor.js) un
 - Supports the default [YAML front matter](https://www.11ty.dev/docs/data-frontmatter/).
 - Supports [AsciiDoc document title](https://docs.asciidoctor.org/asciidoc/latest/document/title/#title-syntax)
 - Other attributes in the AsciiDoc files are made available in templates through `asciidocAttributes`.
-  - Example `:author: Jane Doe` in the `.adoc` file will be available as `asciidocAttrbutes.author`
+  - Example `:author: Jane Doe` in the `.adoc` file will be available as `asciidocAttributes.author`
 
 ## Usage