Docs - Fixed double quotes issue with feature-gates

Double quotes was giving error as below, may be need to update the code to accept the double quotes.

Error: invalid argument "\"GracefulNodeShutdown=true\"" for "--feature-gates" flag: invalid value of "GracefulNodeShutdown=true", err: strconv.ParseBool: parsing "true\"": invalid syntax

Author: gaganyaan2

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -29,7 +29,7 @@ To set feature gates for a component, such as kubelet, use the `--feature-gates`
 flag assigned to a list of feature pairs:
 
 ```shell
---feature-gates="...,GracefulNodeShutdown=true"
+--feature-gates=...,GracefulNodeShutdown=true
 ```
 
 The following tables are a summary of the feature gates that you can set on