Fix some typos in the watchdog/README.md file
Fix some typos in the watchdog/README.md file

Signed-off-by: Jonatas Baldin <a7e06ed847507222ad0884f1885f6cbe6160d284@gmail.com>

openfaas/faas,rgee0/faas,alexellis/faas,alexellis/faas,rgee0/faas,rgee0/faas,rgee0/faas,rgee0/faas,rgee0/faas,alexellis/faas,openfaas/faas,rgee0/faas,openfaas/faas,alexellis/faas,rgee0/faas,alexellis/faas,rgee0/faas,alexellis/faas,alexellis/faas,rgee0/faas,alexellis/faas,alexellis/faas