[PR] Fix build instructions in getting_started.md (brpc)

[via GitHub]

Zzhiter opened a new pull request, #2832:
URL: https://github.com/apache/brpc/pull/2832

   In the previous instructions, the operation of switching to the build 
directory was omitted.
   
![image](https://github.com/user-attachments/assets/a4296d42-31ea-4ad0-9f98-e3d09e9f697b)
   
   


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