Update 'Cách generate id_rsa file'

C%C3%A1ch-generate-id_rsa-file.md

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+ Run this command
+ 
+ ```
+ ssh-keygen
+ ```
+ 
+We can keep all default value by press enter or enter the directory or passphrase.
+
+More info: https://docs.digitalocean.com/products/droplets/how-to/add-ssh-keys/create-with-openssh/

Git.md

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-Welcome to the Wiki.