[docs] Clarify HSB RFSoC artifact locations

[caldwellshane]

Summary

• Clarify that the HSB 2.6.0-EA RFSoC collateral is split between the URM artifact directory and the Holoscan Sensor Bridge release-2.6.0-EA branch.
• Document where to find the prebuilt nvqlink_rfsoc_v2603.bit, the pynq_rfsoc_2603_EA_release.zip reference-design archive, and the matching nv_hsb_ip source directory.
• Add build-placement guidance for nv_hsb_ip, warn against mixing HSB release collateral, and call out the default RFSoC Vivado part target.
• Fix stale cudaq_realtime_message_protocol.bs references to .md and clean up a few wording issues in the realtime docs.

Why

The RFSoC reference archive expects nv_hsb_ip, but that source directory is not inside the archive.
The docs previously pointed users at a single location, which made the HSB IP core hard to find and made it easy to mix artifacts from different HSB releases.

Validation

• Ran git diff --check.
• Reviewed the staged diff before committing.

Notes

This is a documentation-only change.

[github-actions]

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[1tnguyen]

We have a few spell check errors: we can either escape them with backsticks or adding valid words to the spelling_allowlist.txt file.

[caldwellshane]

We have a few spell check errors: we can either escape them with backsticks or adding valid words to the spelling_allowlist.txt file.

Thanks @1tnguyen, I think it's fixed. I also made an extra commit to de-duplicate the references to the installation instructions, using the Sphinx docs as source of truth.

[caldwellshane]

Converted to draft just now. The HSB core is now released, so I'll update the docs accordingly.