[hiprand] [rocrand] Docs: fix embedded license files (#1776)

## Motivation

<!-- Explain the purpose of this PR and the goals it aims to achieve.
-->
Edit links to embedded license files in docs

## Technical Details

<!-- Explain the changes along with any relevant GitHub links. -->
Docs only change.

## Test Plan

<!-- Explain any relevant testing done to verify this PR. -->
NA

## Test Result

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NA

## Submission Checklist

- [ ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

Author: amd-jnovotny

docs/license.rst

@@ -5,4 +5,4 @@
 License
 =======
 
-.. include:: ../LICENSE.txt
+.. include:: ../LICENSE.md