Use quotes for download links

ZSH automatically escape links and breaks copy + paste

Author: Martin Vladev

docs/book/getting_started/installation_and_setup.md

@@ -15,7 +15,7 @@ version=1.0.6 # latest stable version
 arch=amd64
 
 # download the release
-curl -L -O https://github.com/kubernetes-sigs/kubebuilder/releases/download/v${version}/kubebuilder_${version}_darwin_${arch}.tar.gz
+curl -L -O "https://github.com/kubernetes-sigs/kubebuilder/releases/download/v${version}/kubebuilder_${version}_darwin_${arch}.tar.gz"
 
 # extract the archive
 tar -zxvf kubebuilder_${version}_darwin_${arch}.tar.gz
@@ -31,7 +31,7 @@ version=1.0.6 # latest stable version
 arch=amd64
 
 # download the release
-curl -L -O https://github.com/kubernetes-sigs/kubebuilder/releases/download/v${version}/kubebuilder_${version}_linux_${arch}.tar.gz
+curl -L -O "https://github.com/kubernetes-sigs/kubebuilder/releases/download/v${version}/kubebuilder_${version}_linux_${arch}.tar.gz"
 
 # extract the archive
 tar -zxvf kubebuilder_${version}_linux_${arch}.tar.gz