tabletmanager: Remove obsolete comment in healthcheck.go about lameduck.
tabletmanager: Remove obsolete comment in healthcheck.go about lameduck.

In case of the special cases mentioned in the comment, we also enter the lameduck mode. See the code in state_change.go for what is actually implemented.

applift/vitess,vitessio/vitess,sougou/vitess,tirsen/vitess,pivanof/vitess,AndyDiamondstein/vitess,tinyspeck/vitess,mattharden/vitess,pivanof/vitess,enisoc/vitess,AndyDiamondstein/vitess,dumbunny/vitess,mapbased/vitess,mahak/vitess,dumbunny/vitess,tinyspeck/vitess,alainjobart/vitess,mapbased/vitess,alainjobart/vitess,alainjobart/vitess,rnavarro/vitess,davygeek/vitess,applift/vitess,aaijazi/vitess,aaijazi/vitess,davygeek/vitess,sougou/vitess,mapbased/vitess,mahak/vitess,mattharden/vitess,vitessio/vitess,tirsen/vitess,pivanof/vitess,pivanof/vitess,vitessio/vitess,alainjobart/vitess,dumbunny/vitess,AndyDiamondstein/vitess,erzel/vitess,applift/vitess,erzel/vitess,sougou/vitess,applift/vitess,alainjobart/vitess,mahak/vitess,HubSpot/vitess,rnavarro/vitess,tirsen/vitess,mapbased/vitess,HubSpot/vitess,mattharden/vitess,dcadevil/vitess,vitessio/vitess,aaijazi/vitess,HubSpot/vitess,dcadevil/vitess,enisoc/vitess,mattharden/vitess,mattharden/vitess,sougou/vitess,dumbunny/vitess,tinyspeck/vitess,dcadevil/vitess,davygeek/vitess,mapbased/vitess,dcadevil/vitess,mapbased/vitess,dumbunny/vitess,dumbunny/vitess,erzel/vitess,tirsen/vitess,applift/vitess,tirsen/vitess,tinyspeck/vitess,pivanof/vitess,mapbased/vitess,HubSpot/vitess,AndyDiamondstein/vitess,applift/vitess,HubSpot/vitess,mattharden/vitess,erzel/vitess,tirsen/vitess,tinyspeck/vitess,HubSpot/vitess,mattharden/vitess,rnavarro/vitess,erzel/vitess,alainjobart/vitess,dcadevil/vitess,mahak/vitess,erzel/vitess,vitessio/vitess,HubSpot/vitess,vitessio/vitess,davygeek/vitess,rnavarro/vitess,enisoc/vitess,AndyDiamondstein/vitess,alainjobart/vitess,erzel/vitess,sougou/vitess,mahak/vitess,enisoc/vitess,AndyDiamondstein/vitess,mattharden/vitess,pivanof/vitess,vitessio/vitess,AndyDiamondstein/vitess,aaijazi/vitess,applift/vitess,rnavarro/vitess,davygeek/vitess,erzel/vitess,rnavarro/vitess,aaijazi/vitess,tinyspeck/vitess,applift/vitess,mahak/vitess,sougou/vitess,tinyspeck/vitess,tirsen/vitess,dumbunny/vitess,dcadevil/vitess,applift/vitess,vitessio/vitess,davygeek/vitess,sougou/vitess,sougou/vitess,mahak/vitess,mapbased/vitess,erzel/vitess,enisoc/vitess,aaijazi/vitess,dcadevil/vitess,enisoc/vitess,alainjobart/vitess,mahak/vitess,dumbunny/vitess,enisoc/vitess,applift/vitess,pivanof/vitess,tirsen/vitess,AndyDiamondstein/vitess,mapbased/vitess,rnavarro/vitess,AndyDiamondstein/vitess,pivanof/vitess,dumbunny/vitess,mapbased/vitess,aaijazi/vitess,tirsen/vitess,davygeek/vitess,HubSpot/vitess,rnavarro/vitess,dumbunny/vitess,erzel/vitess,rnavarro/vitess,aaijazi/vitess,mattharden/vitess,aaijazi/vitess,pivanof/vitess,mattharden/vitess