Fix typo in Chapter list

docs/intro/index.md

@@ -29,7 +29,7 @@ teaches the language from the ground up and goes much deeper into its features.
 | Title  | Summary | Topics covered |
 | ------ | ------- | -------------- |
 | Counter | Number that can be incremented or decremented | module, Option, `React.string`, pipe last operator, function chaining, switch expression |
-| Numberic Types | Use Melange Playground to explore OCaml’s numeric types | Int, Float, Playground, sharing snippets, comparison operators, arithmetic operators, widgets in Playground |
+| Numeric Types | Use Melange Playground to explore OCaml’s numeric types | Int, Float, Playground, sharing snippets, comparison operators, arithmetic operators, widgets in Playground |
 | Celsius Converter | Single input that converts from  Celsius to Fahrenheit | `Js.t` object, string concatenation (`++`), exception handling, ternary expression, if-else expression, labeled argument, partial application, `{js\|\|js}` quoted string literal |
 | Celsius Converter Using Option | The same component from the last chapter but replacing exception handling with Option | Option, `Option.map`, `when` guard |
 | Introduction to Dune | A introduction to the Dune build system | `dune-project` file, `dune` file, `melange.emit` stanza, monorepo structure |