feat(pdf): fix pdf links to absolute folder (#5341)

Author: Slashgear

pages/instances/reference-content/preventing-outgoing-ddos.mdx

@@ -14,7 +14,7 @@ dates:
 
 A Denial of Service (DoS) attack is an attack through which a person can render a system unusable, or significantly slow it down for legitimate users, by overloading its resources.
 
-[A Distributed Denial of Service (DDoS) attack](DDoS_Quick_Guide.pdf) is a DoS attack that is performed at the same time by a multitude of compromised systems.
+[A Distributed Denial of Service (DDoS) attack](/pdf/DDoS_Quick_Guide.pdf) is a DoS attack that is performed at the same time by a multitude of compromised systems.
 
 The goal of a DoS is not to gain unauthorized access to machines or data, but to prevent legitimate users of a service from using it.
 
@@ -105,4 +105,4 @@ To configure securely your HTTP proxy, proceed as follows:
 ## External References
 
 - (In English) [Denial of Service (DoS) guidance](https://www.ncsc.gov.uk/collection/denial-service-dos-guidance-collection)
-- (In French) [Comprendre et anticiper les attaques DDoS](NP_Guide_DDoS.pdf)
+- (In French) [Comprendre et anticiper les attaques DDoS](/pdf/NP_Guide_DDoS.pdf)

pages/kubernetes/reference-content/kubernetes-cheatsheet.mdx

@@ -21,5 +21,5 @@ This page shows the most common `kubectl` commands for creating and managing Sca
 <Message type="tip">
   This content is also available as a printable PDF file. Click the link below to download:
 
-  - [Kubernetes kubectl cheatsheet - Printable](scaleway-kubernetes-cheatsheet.pdf)
+  - [Kubernetes kubectl cheatsheet - Printable](/pdf/scaleway-kubernetes-cheatsheet.pdf)
 </Message>

pages/kubernetes/reference-content/kubernetes-decision-tree.mdx

@@ -15,7 +15,7 @@ This page helps you evaluate your level of knowledge about Kubernetes and provid
 
 <Message type="tip">
   This content is also available as a printable PDF file. Click the link below to download it:
-  - [Kubernetes decision tree - Printable](decision-tree-kubernetes.pdf)
+  - [Kubernetes decision tree - Printable](/pdf/decision-tree-kubernetes.pdf)
 </Message>
 
 ## Referred content