Fix typo to relative link in Geo SSH docs

doc/gitlab-geo/ssh.md

@@ -9,7 +9,7 @@ file.
 Note this feature is only available on operating systems that support OpenSSH
 6.9 and above. For CentOS 6 and 7, see the [instructions on building custom
 version of OpenSSH for your server]
-(../adminstration/operations/speed_up_ssh.html#compiling-a-custom-version-of-openssh-for-centos).
+(../administration/operations/speed_up_ssh.html#compiling-a-custom-version-of-openssh-for-centos).
 
 For both primary AND secondary nodes, follow the instructions on [configuring
 SSH authorization via database