Improve install docs

darcs-hash:20090829101028-58252-929ab5cd76b768c77c83e169fd37a8e3d048cab4
Fixed parsing of Warning header

Ignore-this: 8d4deac6c92576ef3b6020a596f97c0b

darcs-hash:20090831074917-1e3d8-ea0ba4550bd0f748b4a399e1c374cdb36c0adc51