Handouts: session 2: update handout; added steps to upload data from berlin

git-svn-id: https://repo.thevirtualbrain.org/svn/tvb/trunk/tvb_documentation@6212 1c0e02f0-7929-43c0-8fb3-3293bf43b0d1
TVB-1455
Fix online help link for the Sensors Viewers.
Add short description what the "parcellation" on sensors EEG viewer means.


git-svn-id: https://repo.thevirtualbrain.org/svn/tvb/trunk/tvb_documentation@6237 1c0e02f0-7929-43c0-8fb3-3293bf43b0d1