[Docs] Graql docs might need better naming of .gql files

[neomatrix369]

Problem to Solve

In the https://dev.grakn.ai/docs/general/quickstart doc, schema.gql is too generic, call it friendship-schema.gql, or something more descriptive - maybe grakn-friendship-schema.gpl! They will be downloading more such schemas in the future, from your site and elsewhere, let them not be lost in their download folder.

Question: Feel free to study the content of social-network-schema.gql. <=== which schema is this talking about, please fix this if its a typo?

Current Workaround

Keep track of the .gql files downloaded.

Proposed Solution

Give relevant graql download files representative names.

Additional Information

On the back of the slack channel discussions

[alexjpwalker]

Migrated to typedb/typedb-docs#570