By Dan Weil Bonds are now attractive for those looking to strengthen the fixed-income portion of their portfolios. While the Federal Reserve’s interest-rate increases have sent stock prices reeling, they have sent bond yields soaring. And that has made bonds attractive for those of us looking to buttress the fixed-income portion of our portfolios. If you buy safe, individual bonds and hold them until maturity, you will almost surely receive par value for the bonds upon maturity. And you can enjoy yields close to or more than 5%. Most investment experts recommend holding at least some bonds in …