Limit shell snippet line length in Package Maintenance Guide
    
    For some shell snippets, the Package Maintenance Guide page used
    a style where comment about certain command was written in the same
    line after the command. Initially, this worked well when the commands
    were short, but since then some quite long commands have been added,
    leading to very long lines. Improve readability by swithing to
    style where comments are on separate lines just before commands.