Fix links in quickstart.md

Author: Martin Vladev

docs/book/quick_start.md

@@ -17,11 +17,11 @@ This Quick Start guide will cover:
 
 {% sample lang="mac" %}
 ```bash
-version=1.0.6 # latest stable version
+version=1.0.7 # 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
@@ -33,11 +33,11 @@ export PATH=$PATH:/usr/local/kubebuilder/bin
 
 {% sample lang="linux" %}
 ```bash
-version=1.0.6 # latest stable version
+version=1.0.7 # 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