docs: renames Comodo to Sectigo (#27232)
docs: renames Comodo to Sectigo (#27232)

The certificate authority mentioned "Comodo" has recently been renamed
"Sectigo". This updates the name of the certificate authority, and the
link to get the code signing certificates for Sectigo/Comodo.
gerhardberger/electron,bpasero/electron,gerhardberger/electron,electron/electron,bpasero/electron,electron/electron,bpasero/electron,gerhardberger/electron,electron/electron,bpasero/electron,electron/electron,electron/electron,electron/electron,bpasero/electron,gerhardberger/electron,gerhardberger/electron,bpasero/electron,gerhardberger/electron,bpasero/electron,electron/electron,gerhardberger/electron