Updated docs

docs/references/database/delete-document.md

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-Delete document by its unique ID. This endpoint deletes only the parent documents, its attributes and relations to other documents. Child documents **will not** be deleted.
+Delete a document by its unique ID. This endpoint deletes only the parent documents, its attributes and relations to other documents. Child documents **will not** be deleted.

docs/references/database/get-collection.md

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-Get collection by its unique ID. This endpoint response returns a JSON object with the collection metadata.
+Get a collection by its unique ID. This endpoint response returns a JSON object with the collection metadata.

docs/references/database/get-document.md

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-Get document by its unique ID. This endpoint response returns a JSON object with the document data.
+Get a document by its unique ID. This endpoint response returns a JSON object with the document data.

docs/references/database/update-collection.md

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-Update collection by its unique ID.
+Update a collection by its unique ID.

docs/references/database/update-document.md

@@ -0,0 +1 @@
+Update a document by its unique ID. Using the patch method you can pass only specific fields that will get updated.