message: put correct documentation location in Cargo.toml
diff: @@ -8,7 +8,7 @@ authors = ["Vincent Barrielle <vincent.barrielle@m4x.org>"]
  readme = "README.rst"
  license = "MIT OR Apache-2.0"
  repository = "https://github.com/vbarrielle/sprs"
  -documentation = "https://vbarrielle.github.io/sprs/doc/sprs/"
  +documentation = "https://docs.rs/sprs"
  keywords = ["sparse", "matrix", "linear", "algebra"]
  exclude = [
  