Hello,
SSHLibrary has been transferred to MarketSquare: GitHub - MarketSquare/SSHLibrary: Robot Framework test library for SSH and SFTP
The reason is that it rather is a community extension than a core-library.
Hopefully the only side effect being is that keyword documentation is now under https://marketsquare.github.io/SSHLibrary/SSHLibrary.html
If you find further issues, please reply.
Markus