Fix typo in scaladoc doc

Author: rjolly

docs/docs/usage/scaladoc/index.md

@@ -4,7 +4,7 @@ title: scaladoc
 
 ![scaladoc logo](/images/scaladoc-logo.png)
 
-scaladoc is tool to generate documentation for your Scala 3 projects. It provies similar features to `javadoc` as well as `jekyll` or `docusaurus`.
+scaladoc is a tool to generate documentation for your Scala 3 projects. It provides similar features to `javadoc` as well as `jekyll` or `docusaurus`.
 
 As you probably have guessed, this whole site was created using scaladoc.