types: remove dots from errors in SignedHeader#ValidateBasic

types/block.go

@@ -698,10 +698,10 @@ func (sh SignedHeader) ValidateBasic(chainID string) error {
 
 	// Make sure the header is consistent with the commit.
 	if sh.Header == nil {
-		return errors.New("signedHeader missing header.")
+		return errors.New("signedHeader missing header")
 	}
 	if sh.Commit == nil {
-		return errors.New("signedHeader missing commit (precommit votes).")
+		return errors.New("signedHeader missing commit (precommit votes)")
 	}
 
 	// Check ChainID.