core/os/shell: Remove comment about 'watchdog'
core/os/shell: Remove comment about 'watchdog'

Seems to be relating to something that no longer exists.

pmuetschard/gapid,ek9852/gapid,baldwinn860/gapid,dsrbecky/gapid,dsrbecky/gapid,google/agi,google/agi,google/gapid,pmuetschard/gapid,ek9852/gapid,google/agi,ek9852/gapid,google/gapid,dsrbecky/gapid,baldwinn860/gapid,google/gapid,google/gapid,ek9852/gapid,Qining/gapid,Qining/gapid,pmuetschard/gapid,baldwinn860/gapid,dsrbecky/gapid,pmuetschard/gapid,google/agi,dsrbecky/gapid,pmuetschard/gapid,google/gapid,baldwinn860/gapid,dsrbecky/gapid,dsrbecky/gapid,Qining/gapid,google/agi,ek9852/gapid,pmuetschard/gapid,Qining/gapid,baldwinn860/gapid,pmuetschard/gapid,ek9852/gapid,Qining/gapid,dsrbecky/gapid,google/gapid,google/agi,Qining/gapid,Qining/gapid,Qining/gapid,baldwinn860/gapid,google/gapid,google/gapid,baldwinn860/gapid,ek9852/gapid,pmuetschard/gapid,google/agi,ek9852/gapid,baldwinn860/gapid,google/agi