Sync `vpxenc --timebase` usage wording with docs change.
Sync `vpxenc --timebase` usage wording with docs change.

Change-Id: Ia406272a97806c0194435bb7f24e24d353ef5cc6

mwgoldsmith/vpx,openpeer/libvpx_new,iniwf/webm.libvpx,thdav/aom,abwiz0086/webm.libvpx,lyx2014/libvpx_c,altogother/webm.libvpx,n4t/libvpx,zofuthan/libvpx,vasilvv/esvp8,kleopatra999/webm.libvpx,kalli123/webm.libvpx,thdav/aom,Topopiccione/libvpx,mbebenita/aom,zofuthan/libvpx,ittiamvpx/libvpx,running770/libvpx,turbulenz/libvpx,webmproject/libvpx,WebRTC-Labs/libvpx,goodleixiao/vpx,openpeer/libvpx_new,jacklicn/webm.libvpx,smarter/aom,liqianggao/libvpx,Maria1099/webm.libvpx,matanbs/webm.libvpx,mwgoldsmith/libvpx,felipebetancur/libvpx,genesi/libvpx0,Distrotech/libvpx,stewnorriss/libvpx,ittiamvpx/libvpx-1,Maria1099/webm.libvpx,sanyaade-teachings/libvpx,mbebenita/aom,goodleixiao/vpx,matanbs/vp982,GrokImageCompression/aom,goodleixiao/vpx,smarter/aom,awatry/libvpx.opencl,turbulenz/libvpx,altogother/webm.libvpx,turbulenz/libvpx,kleopatra999/webm.libvpx,mbebenita/aom,mwgoldsmith/libvpx,shareefalis/libvpx,VTCSecureLLC/libvpx,smarter/aom,reimaginemedia/webm.libvpx,cinema6/libvpx,Maria1099/webm.libvpx,liqianggao/libvpx,thdav/aom,shacklettbp/aom,awatry/libvpx.opencl,mbebenita/aom,zofuthan/libvpx,kim42083/webm.libvpx,rikaunite/gst-opera_libvpx,stewnorriss/libvpx,matanbs/webm.libvpx,mwgoldsmith/vpx,rikaunite/gst-opera_libvpx,matanbs/webm.libvpx,ittiamvpx/libvpx,shacklettbp/aom,cinema6/libvpx,smarter/aom,WebRTC-Labs/libvpx,mbebenita/aom,luctrudeau/aom,Acidburn0zzz/webm.libvpx,altogother/webm.libvpx,Maria1099/webm.libvpx,pcwalton/libvpx,Acidburn0zzz/webm.libvpx,goodleixiao/vpx,GrokImageCompression/aom,Laknot/libvpx,Suvarna1488/webm.libvpx,matanbs/vp982,felipebetancur/libvpx,goodleixiao/vpx,Laknot/libvpx,Suvarna1488/webm.libvpx,VTCSecureLLC/libvpx,kim42083/webm.libvpx,hsueceumd/test_hui,Acidburn0zzz/webm.libvpx,felipebetancur/libvpx,pcwalton/libvpx,genesi/libvpx0,pcwalton/libvpx,WebRTC-Labs/libvpx,felipebetancur/libvpx,matanbs/vp982,kim42083/webm.libvpx,VTCSecureLLC/libvpx,kim42083/webm.libvpx,mbebenita/aom,n4t/libvpx,felipebetancur/libvpx,shareefalis/libvpx,sanyaade-teachings/libvpx,abwiz0086/webm.libvpx,liqianggao/libvpx,abwiz0086/webm.libvpx,mwgoldsmith/libvpx,zofuthan/libvpx,ittiamvpx/libvpx-1,jacklicn/webm.libvpx,lyx2014/libvpx_c,abwiz0086/webm.libvpx,shacklettbp/aom,genesi/libvpx0,vasilvv/esvp8,genesi/libvpx0,genesi/libvpx0,mwgoldsmith/libvpx,turbulenz/libvpx,zofuthan/libvpx,cinema6/libvpx,shacklettbp/aom,hsueceumd/test_hui,stewnorriss/libvpx,luctrudeau/aom,mwgoldsmith/vpx,mwgoldsmith/libvpx,turbulenz/libvpx,matanbs/vp982,Topopiccione/libvpx,reimaginemedia/webm.libvpx,jmvalin/aom,jmvalin/aom,Laknot/libvpx,Distrotech/libvpx,cinema6/libvpx,shareefalis/libvpx,sanyaade-teachings/libvpx,Laknot/libvpx,mwgoldsmith/vpx,shyamalschandra/libvpx,abwiz0086/webm.libvpx,VTCSecureLLC/libvpx,openpeer/libvpx_new,pcwalton/libvpx,luctrudeau/aom,awatry/libvpx.opencl,jdm/libvpx,GrokImageCompression/aom,WebRTC-Labs/libvpx,Distrotech/libvpx,Topopiccione/libvpx,luctrudeau/aom,mbebenita/aom,Acidburn0zzz/webm.libvpx,cinema6/libvpx,mwgoldsmith/libvpx,jmvalin/aom,vasilvv/esvp8,webmproject/libvpx,kalli123/webm.libvpx,vasilvv/esvp8,lyx2014/libvpx_c,vasilvv/esvp8,shyamalschandra/libvpx,reimaginemedia/webm.libvpx,shacklettbp/aom,liqianggao/libvpx,iniwf/webm.libvpx,kleopatra999/webm.libvpx,running770/libvpx,lyx2014/libvpx_c,Distrotech/libvpx,ShiftMediaProject/libvpx,charup/https---github.com-webmproject-libvpx-,mbebenita/aom,shareefalis/libvpx,gshORTON/webm.libvpx,iniwf/webm.libvpx,thdav/aom,reimaginemedia/webm.libvpx,Suvarna1488/webm.libvpx,GrokImageCompression/aom,hsueceumd/test_hui,ittiamvpx/libvpx-1,VTCSecureLLC/libvpx,Acidburn0zzz/webm.libvpx,GrokImageCompression/aom,charup/https---github.com-webmproject-libvpx-,matanbs/vp982,shareefalis/libvpx,Topopiccione/libvpx,thdav/aom,jacklicn/webm.libvpx,stewnorriss/libvpx,kim42083/webm.libvpx,matanbs/webm.libvpx,openpeer/libvpx_new,jdm/libvpx,turbulenz/libvpx,openpeer/libvpx_new,luctrudeau/aom,felipebetancur/libvpx,hsueceumd/test_hui,charup/https---github.com-webmproject-libvpx-,jdm/libvpx,genesi/libvpx0,Suvarna1488/webm.libvpx,running770/libvpx,gshORTON/webm.libvpx,rikaunite/gst-opera_libvpx,charup/https---github.com-webmproject-libvpx-,kim42083/webm.libvpx,liqianggao/libvpx,iniwf/webm.libvpx,ittiamvpx/libvpx,kalli123/webm.libvpx,altogother/webm.libvpx,altogother/webm.libvpx,running770/libvpx,turbulenz/libvpx,charup/https---github.com-webmproject-libvpx-,ittiamvpx/libvpx-1,vasilvv/esvp8,ittiamvpx/libvpx,luctrudeau/aom,pcwalton/libvpx,matanbs/webm.libvpx,ittiamvpx/libvpx,cinema6/libvpx,iniwf/webm.libvpx,mbebenita/aom,vasilvv/esvp8,running770/libvpx,sanyaade-teachings/libvpx,kleopatra999/webm.libvpx,jacklicn/webm.libvpx,altogother/webm.libvpx,gshORTON/webm.libvpx,hsueceumd/test_hui,Suvarna1488/webm.libvpx,Distrotech/libvpx,reimaginemedia/webm.libvpx,openpeer/libvpx_new,stewnorriss/libvpx,ittiamvpx/libvpx,n4t/libvpx,shacklettbp/aom,abwiz0086/webm.libvpx,jdm/libvpx,jdm/libvpx,jacklicn/webm.libvpx,webmproject/libvpx,turbulenz/libvpx,gshORTON/webm.libvpx,shyamalschandra/libvpx,shyamalschandra/libvpx,matanbs/vp982,jd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