docs(guide): fix typos in link

Author: BobAnkh

guide/book.toml

@@ -7,6 +7,6 @@ title = "Mitosis Documentation"
 description = "Mitosis is a Rust library and a command line tool to run distributed platforms for transport research."
 
 [output.html]
-git-repository-url = "https://github.com/stack-rs/mitosis/tree/master/guide"
-edit-url-template = "https://github.com/stack-rs/mitosis/edit/master/guide/{path}"
+git-repository-url = "https://github.com/stack-rs/mitosis/tree/main/guide"
+edit-url-template = "https://github.com/stack-rs/mitosis/edit/main/guide/{path}"
 site-url = "/mitosis/"