Remove Google doc link for metadata tips access

Removed a Google doc link for requesting edit access to metadata tips.

Author: Parthsuii

doc/sphinx-guides/source/admin/metadatacustomization.rst

@@ -666,8 +666,6 @@ When creating new metadata blocks, please review the :doc:`/style/text` section
 
 If there are tips that you feel are omitted from this document, please open an issue at https://github.com/IQSS/dataverse/issues and consider making a pull request to make improvements. You can find this document at https://github.com/IQSS/dataverse/blob/develop/doc/sphinx-guides/source/admin/metadatacustomization.rst
 
-Alternatively, you are welcome to request "edit" access to this "Tips for Dataverse Software metadata blocks from the community" Google doc: https://docs.google.com/document/d/1XpblRw0v0SvV-Bq6njlN96WyHJ7tqG0WWejqBdl7hE0/edit?usp=sharing
-
 The thinking is that the tips can become issues and the issues can eventually be worked on as features to improve the Dataverse Software metadata system.
 
 Development Tasks Specific to Changing Fields in Core Metadata Blocks