Avoid superfluous quotes in request-gated-side-tag help
    
        $ centpkg request-gated-side-tag
        Side tag 'c10s-build-side-3820-stack-gate' (id 3820) created.
        Use 'centpkg build --target=c10s-build-side-3820-stack-gate' to use it.
        Use '"koji -p stream" wait-repo c10s-build-side-3820-stack-gate' to wait for the build repo to be generated.
    
    There is no such thing as  '"koji -p stream" wait-repo ...'.
    I believe the quotes are superfluous.
    
    Signed-off-by: Miro Hrončok <miro@hroncok.cz>