You could have just searched for it. The last paragraph of https://www.gnupg.org/gph/en/manual/x135.html https://www.gnupg.org/gph/en/manual/x135.html says:

You could have just searched for it. The last paragraph of https://www.gnupg.org/gph/en/manual/x135.html https://www.gnupg.org/gph/en/manual/x135.html says: gpg --verify doc.sig doc (the difference between .sig and .asc in this case is only that the latter is plaintext)