[DOCS] DLStreamer name alignment

[wiwaszko-intel]

Description

Name alignment fixes for instances of DL Streamer name
Update: also includes fixes for link refs to new DL Streamer repo

Checklist:

• [ X ] I agree to use the MIT license for my code changes
• [ X ] I have not introduced any 3rd party dependency changes
• [ X ] I have performed a self-review of my code

[wiwaszko-intel]

Extending scope to fix link refs to new DLS repo.