Add some more docs on how to use the ID3v1::StringHandler in the ID3v1::Tag documentation.
Add some more docs on how to use the ID3v1::StringHandler in the ID3v1::Tag
documentation.

BUG:90634


git-svn-id: 7928e23e4d58c5ca14aa7b47c53aeff82ee1dd0c@356354 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

dlz1123/taglib,davispuh/taglib,dlz1123/taglib,TsudaKageyu/taglib,pbhd/taglib,Distrotech/taglib,videolabs/taglib,MaxLeb/taglib,MaxLeb/taglib,i80and/taglib,dlz1123/taglib,TsudaKageyu/taglib,pbhd/taglib,MaxLeb/taglib,crystax/cosp-android-taglib,videolabs/taglib,black78/taglib,videolabs/taglib,crystax/cosp-android-taglib,taglib/taglib,davispuh/taglib,Distrotech/taglib,davispuh/taglib,black78/taglib,taglib/taglib,i80and/taglib,taglib/taglib,i80and/taglib,pbhd/taglib,Distrotech/taglib,TsudaKageyu/taglib,black78/taglib