Replace Digital Asset Mentions to Canton Network Mentions in new docs

[Jatinp26]

[miller-da]

@Jatinp26 are we replacing Digital Asset in copyright mentions? i.e.

# Copyright (c) 2025 Digital Asset (Switzerland) GmbH and/or its affiliates. All rights reserved.
# SPDX-License-Identifier: Apache-2.0

[miller-da]

Are we updated Digital Asset Package Manager (DPM) to Canton Network Package Manager?

This guide requires the Digital Asset Package Manager. Follow installation instructions at [DPM](/sdks-tools/cli-tools/dpm).

[miller-da]

Do we have an updated support email address?

**Email:** [support@digitalasset.com](mailto:support@digitalasset.com)

[miller-da]

Initial PR to address this issue at #706

[Jatinp26]

Hey @miller-da

We can keep things like support@digitalasset.com same as digital Asset is maintainer and core contributors of splice and Canton network so it's on their support fits

e.g. on page https://docs.canton.network/shared/support-channels it says
Multiple support channels are available depending on your needs and relationship with Digital Asset.
Where I believe it should say

Multiple support channels are available depending on your needs and relationship with Canton Network