Remove mentions of SeanPackham since he's no longer with GitLab

doc/development/doc_styleguide.md

@@ -105,8 +105,8 @@ merge request.
   considered beta or experimental, put this info in a note, not in the heading.
 - When introducing a new document, be careful for the headings to be
   grammatically and syntactically correct. It is advised to mention one or all
-  of the following GitLab members for a review: `@axil`, `@rspeicher`, `@marcia`,
-  `@SeanPackham`. This is to ensure that no document with wrong heading is going
+  of the following GitLab members for a review: `@axil`, `@rspeicher`, `@marcia`.
+  This is to ensure that no document with wrong heading is going
   live without an audit, thus preventing dead links and redirection issues when
   corrected
 - Leave exactly one newline after a heading

doc/university/process/README.md

@@ -27,4 +27,4 @@ please submit a merge request to add an upcoming class, assign to
 1. Please upload any video recordings to our Youtube channel. We prefer them to
    be public, if needed they can be unlisted but if so they should be linked from
    this page.
-1. Please create a merge request and assign to [SeanPackham](https://gitlab.com/u/SeanPackham).
+1. Please create a merge request and assign to [Erica](https://gitlab.com/u/Erica).