ofdmflexframe: fixing typo in 'help' (SNR is nominally 20 dB, not 30)
ofdmflexframe: fixing typo in 'help' (SNR is nominally 20 dB, not 30)

JayKickliter/liquid-dsp,jgaeddert/liquid-dsp,wangning223/liquid-dsp,biotrump/liquid-dsp,biotrump/liquid-dsp,biotrump/liquid-dsp,jgaeddert/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,JayKickliter/liquid-dsp,biotrump/liquid-dsp,JayKickliter/liquid-dsp,wangning223/liquid-dsp,cjcliffe/liquid-dsp,manuts/liquid-dsp,cjcliffe/liquid-dsp,biotrump/liquid-dsp,wangning223/liquid-dsp,andrepuschmann/liquid-dsp,JayKickliter/liquid-dsp,andrepuschmann/liquid-dsp,JayKickliter/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp,manuts/liquid-dsp,cjcliffe/liquid-dsp,jgaeddert/liquid-dsp,jgaeddert/liquid-dsp,andrepuschmann/liquid-dsp,andrepuschmann/liquid-dsp,cjcliffe/liquid-dsp,cjcliffe/liquid-dsp,jgaeddert/liquid-dsp