Update copyright line and v3.0.0

Signed-off-by: Arthit Suriyawongkul <arthit@gmail.com>

mkdocs.yml

@@ -1,16 +1,16 @@
 site_name: SPDX v3 Specification
-site_description: The System Package Data Exchange (SPDX) Specification Version 3.0
-site_author: Linux Foundation and its Contributors
+site_description: The System Package Data Exchange (SPDX) Specification Version 3.0.0
+site_author: Linux Foundation and its Contributors, including SPDX Model contributions from OMG and its Contributors
 site_url: https://spdx.github.io/spdx-spec/  # set to the "root" of the site, to be combined with canonical_version
 repo_url: https://github.com/spdx/spdx-spec/
 edit_uri: ""  # set to an empty string to disable edit links; to enable, set to blob/development/v3.0.1/docs/
-copyright: SPDX v3.0 Copyright © 2010-2024 Linux Foundation and its Contributors.
+copyright: SPDX v3.0.0 Copyright © 2010-2024, Linux Foundation and its Contributors, including SPDX Model contributions from OMG and its Contributors.
 use_directory_urls: true
 theme: readthedocs
 plugins:
 - search
 - mike:
-    canonical_version: latest  # tell search engines to prefer the latest version
+    canonical_version: v3.0.0  # once v3.0 is an alias for v3.0.x, original v3.0 will be known as v3.0.0
     alias_type: redirect  # use redirect so the URL in the browser changes
 - pdf-export:
     combined: true