Change accessibility language in service doc; (DOECODE-446)

Author: sowerstl

src/main/java/gov/osti/services/Metadata.md

@@ -337,7 +337,7 @@ A full JSON example is [provided below.](#json_example)
 | Field Name | Description |
 | --- | --- |
 | code_id | The unique value given to a particular DOE CODE Project record once stored.  Should be *null* or not provided for new entries, and will be returned once a record is saved or submitted successfully. |
-| accessibility | Project source code accessibility value; must be one of "OS" (open source), "ON" (open source, not public) or "CS" (closed source) |
+| accessibility | This refers to how the source of the project type is accessed; must be one of "OS" (open source), "ON" (open source, not public), "CS" (closed source, site hosted), or "CO" (closed source, OSTI hosted) |
 | repository_link | If the software project is available via public hosting service, such as github.com, bitbucket.org, etc. the public repository URL should be provided here. |
 | landing_page | If the project is not available via open source hosting site, provide a URL describing the project and contact information for obtaining binary or source |
 | developers | An array of Objects, providing information about a project's developers or creators. Fields are [specified below.](#persons_fields) |