add Stanford University to brands/amenity/university

[Shubham0523]

This PR adds Stanford University to the brands/amenity/university category in the NSI.

• Wikidata ID: Q41506
• Reason for inclusion: Stanford University is a globally recognized academic institution with a significant presence in various countries through research collaborations, satellite locations, and global academic influence.
• Meets NSI requirements: It has a valid Wikidata tag and fulfills the notability threshold due to its widespread impact and recognition.

Additional Notes

Stanford's inclusion will improve the accuracy and comprehensiveness of university-related tagging in OpenStreetMap, particularly for editors using NSI presets like iD Editor.

[Shubham0523]

please review the PR. @arch0345

[bhousel]

Sorry @Shubham0523 , but we don't add individual colleges or universities to this index - we only add the kind of for-profit "universities” that operate like a branded business in multiple locations, such as DeVry or University of Phoenix. I know this is an unusual concept outside of the USA - the “universities” in the name-suggestion-index are really more like training centers than true universities.