fix vs_runtime

README.md

@@ -100,7 +100,7 @@ $ xrepo install -k shared zlib
 #### Install the specified configuration package
 
 ```console
-$ xrepo install -f "vs_runtime="MD"" zlib
+$ xrepo install -f "vs_runtime='MD'" zlib
 $ xrepo install -f "regex=true,thread=true" boost
 ```
 

getting_started.md

@@ -96,7 +96,7 @@ $ xrepo install -k shared zlib
 #### Install the specified configuration package
 
 ```console
-$ xrepo install -f "vs_runtime="MD"" zlib
+$ xrepo install -f "vs_runtime='MD'" zlib
 $ xrepo install -f "regex=true,thread=true" boost
 ```
 

zh-cn/README.md

@@ -97,7 +97,7 @@ $ xrepo install -k shared zlib
 #### 安装指定配置包
 
 ```console
-$ xrepo install -f "vs_runtime="MD"" zlib
+$ xrepo install -f "vs_runtime='MD'" zlib
 $ xrepo install -f "regex=true,thread=true" boost
 ```
 

zh-cn/getting_started.md

@@ -97,7 +97,7 @@ $ xrepo install -k shared zlib
 #### 安装指定配置包
 
 ```console
-$ xrepo install -f "vs_runtime="MD"" zlib
+$ xrepo install -f "vs_runtime='MD'" zlib
 $ xrepo install -f "regex=true,thread=true" boost
 ```