Last minor corrections

slides/content.md

@@ -364,7 +364,7 @@ in L4-7, however these usually require specific tools to debug
 
 # Wireguard
 [Link to Slides](https://slides.poul.org/2019/corsi-linux/3c_wireguard.pdf)  
-[Link to Video](https://example.org)
+[Link to Video](https://youtu.be/Ppw6XxbmlWA)
 
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@@ -461,7 +461,7 @@ configuration that might help to debug problems.
 
 # Ansible
 [Link to Slide](https://slides.poul.org/2019/corsi-linux/4b_ansible/)  
-[Link to Video](https://example.org)
+[Link to Video](https://youtu.be/Cc396Em2BuM)
 
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@@ -806,7 +806,7 @@ However do note that both these tunnels might not support the full bandwidth
 
 * ppp for connecting to PPPoE
 * Systemd-networkd for managing connections  
-  (only network manager that supports most ISPs configurations fully)
+  (It is the only network manager that supports most ISPs configurations fully)
 
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