[rocm-libraries] ROCm/rocm-libraries#2651 (commit 7261e05)

Centos removal

## Motivation

Removing outdated references to CentOS in the hipRAND / rocRAND docs.

## Technical Details

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## Test Plan

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## Test Result

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## Submission Checklist

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

Author: mattwill-amd

docs/install/installing.rst

@@ -52,12 +52,6 @@ For Ubuntu and Debian:
 
    sudo apt-get install rocrand
 
-For CentOS-based systems:
-
-.. code-block:: shell
-
-   sudo yum install rocrand
-
 For SLES:
 
 .. code-block:: shell