Update redhat-rhui.md

Added an instruction to preload the repo config file for the RHEL 8 distribution, there is a bug that affects early releases that does not support URIs for the config file location.

Author: esvmicrosoft

articles/virtual-machines/workloads/redhat/redhat-rhui.md

@@ -125,7 +125,8 @@ Use the following procedure to lock a RHEL 8.x VM to a particular minor release.
 1. Add EUS repositories.
 
    ```bash
-   sudo dnf --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8-eus.config' install rhui-azure-rhel8-eus
+   wget https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8-eus.config
+   sudo dnf --config=rhui-microsoft-azure-rhel8-eus.config install rhui-azure-rhel8-eus
    ```
 
 
@@ -206,7 +207,7 @@ To remove the version lock, use the following commands. Run the commands as `roo
 1. Add non-EUS repository.
 
    ```bash
-   sudo yum --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel7.config' install rhui-azure-rhel7
+   sudo yum --config=https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel7.config install rhui-azure-rhel7
    ```
 
 1. Update your RHEL VM.
@@ -234,7 +235,8 @@ To remove the version lock, use the following commands. Run the commands as `roo
 1. Add non-EUS repository.
 
    ```bash
-   sudo dnf --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8.config' install rhui-azure-rhel8
+   wget https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8.config
+   sudo dnf --config=rhui-microsoft-azure-rhel8.config install rhui-azure-rhel8
    ```
 
 1. Update your RHEL VM.