Update update-linux-agent.md

line 254, 325: original sed command currently does not change the AutoUpdate setting ('n' by default on Debian 9), the Debian 9 image in the marketplace seems to have changed the wording of the commented line before the AutoUpdate setting.

line 332: repo name now appears to be oracle-linux-o17.repo when looking in a provisioned Oracle Linux 7 VM's addon settings.
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cc: @MsGabsta

Author: ericd-mst-github

articles/virtual-machines/extensions/update-linux-agent.md

@@ -251,7 +251,7 @@ AutoUpdate.Enabled=y
 To enable run:
 
 ```bash
-sudo sed -i 's/# AutoUpdate.Enabled=n/AutoUpdate.Enabled=y/g' /etc/waagent.conf
+sudo sed -i 's/AutoUpdate.Enabled=n.*/AutoUpdate.Enabled=y/g' /etc/waagent.conf
 ```
 
 Restart the waagent service
@@ -322,14 +322,14 @@ AutoUpdate.Enabled=y
 To enable run:
 
 ```bash
-sudo sed -i 's/# AutoUpdate.Enabled=n/AutoUpdate.Enabled=y/g' /etc/waagent.conf
+sudo sed -i 's/AutoUpdate.Enabled=n.*/AutoUpdate.Enabled=y/g' /etc/waagent.conf
 Restart the waagent service
 sudo systemctl restart walinuxagent.service
 ```
 
 ## Oracle Linux 6 and Oracle Linux 7
 
-For Oracle Linux, make sure that the `Addons` repository is enabled. Choose to edit the file `/etc/yum.repos.d/public-yum-ol6.repo`(Oracle Linux 6) or `/etc/yum.repos.d/public-yum-ol7.repo`(Oracle Linux), and change the line `enabled=0` to `enabled=1` under **[ol6_addons]** or **[ol7_addons]** in this file.
+For Oracle Linux, make sure that the `Addons` repository is enabled. Choose to edit the file `/etc/yum.repos.d/public-yum-ol6.repo`(Oracle Linux 6) or `/etc/yum.repos.d/oracle-linux-o17.repo`(Oracle Linux), and change the line `enabled=0` to `enabled=1` under **[ol6_addons]** or **[ol7_addons]** in this file.
 
 Then, to install the latest version of the Azure Linux Agent, type: