add mistakenly erased part of Actor components

Author: TC-MO

sources/platform/actors/index.mdx

@@ -40,7 +40,7 @@ To see what a published Actor looks like and how it works, let's run an SEO audi
 Actors consist of these elements:
 
 - A _Dockerfile_ that specifies where the Actor's source code is, how to build it, and how to run it.
-- I in the form of a README.md file.
+- _Documentation_ in the form of a README.md file.
 - _Input and output schemas_ that describe the Actor's required input and the results it produces.
 - Access to an out-of-the-box _storage system_ for Actor data, results, and files.
 - _Metadata_ such as the Actor's name, description, author, and version.