[GitHub] [pulsar] Monica-zy opened a new pull request #5124: [doc] fix the wrong file extension name

[GitBox]

Monica-zy opened a new pull request #5124: [doc] fix the wrong file extension 
name 
URL: https://github.com/apache/pulsar/pull/5124
 
 
   Modifications：
   fix the mistyped file extension name of security-overview.md in file  
getting-started-standalone.md
   
![image](https://user-images.githubusercontent.com/44013755/64330160-09d5da00-d003-11e9-978a-8c84d96cb508.png)
   

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