[docs] Document versioned docs removal

Author: andrewnicols

general/documentation/forking-versions.md

@@ -46,4 +46,24 @@ Typically this task is performed by the Integration team using the following ste
 
 ## Archiving a version of the docs
 
-This procedure has not yet been completed and documentation will be created when we do so.
+The archival of a set of documentation usually happens immediately after the forking of documentation for the latest version.
+
+1. After the Pull Request for this new version has been accepted, navigate to the Deploy Logs, and locate its "Permalink".
+1. Remove the entire folder from `versioned_docs` and `versioned_sidebars`:
+
+    ```bash
+    rm -rf versioned_docs/version-4.3 versioned_sidebars/version-4.3-*
+    ```
+
+1. Commit the changes
+1. Update any remaining references to the version:
+    1. Open the `versionsArchived.json` file and add the full link to the Netlify build.
+    1. Open the `versions.json` file and remove the version from the list
+    1. Search for any remaining occurrences as a path, for example:
+
+        ```bash
+        ag '/4\.3/'
+        ```
+
+1. Commit these changes
+1. Create a pull request