Improved method documentation
Improved method documentation

Update issue 92

Went through the methods once more and improved the documentation slightly
here and there.

junousia/SSHLibrary,jussimalinen/SSHLibrary,haeygen/SSHLibrary,junousia/SSHLibrary,jussimalinen/SSHLibrary,garybehrend/robotframework-sshlibrary,haeygen/SSHLibrary,garybehrend/robotframework-sshlibrary