typo: getMatch (#613)

Author: Soya-xy

website/guide/api-usage/js-api.md

@@ -285,7 +285,7 @@ const newSource = node.commitEdits([edit])
 Note, `console.error($A)` will not generate `console.error('hello world')` in JavaScript API unlike the CLI. This is because using the host language to generate the replacement string is more flexible.
 
 :::warning
-Metavariable will not be replaced in the `replace` method. You need to create a string using `get_match(var_name)` by using JavaScript.
+Metavariable will not be replaced in the `replace` method. You need to create a string using `getMatch(var_name)` by using JavaScript.
 :::
 
 See also [ast-grep#1172](https://github.com/ast-grep/ast-grep/issues/1172)