Editor

An Editor is a person who makes edits (changes) to documents.

More specifically the word editor can  mean:
 a person who changes texts; see copy editing.
 a newspaper or magazine editor is a person who prepares articles for printing and sometimes chooses which articles to put in the newspaper. The main editor of a newspaper or magazine is called the "editor-in chief".
 a Wikipedia user who makes changes (also called "edits") to pages (articles, templates, categories, etc)
 text editor, an application program for editing an electronic text or media document
 one who, or that which, edits photos
 film editor, a person who edits movies
 a human or machine for movie film or video editing