http_archive: remove outdated comment
http_archive from does know how to bring its own
BUILD file by now.
@@ -109,9 +109,6 @@ http_archive = repository_rule(
"""Downloads a Bazel repository as a compressed archive file, decompresses it,
and makes its targets available for binding.
-The repository should already contain a BUILD file. If it does not, use
-`new_http_archive` instead.
-
It supports the following file extensions: `"zip"`, `"jar"`, `"war"`,
`"tar.gz"`, `"tgz"`, `"tar.xz"`, and `tar.bz2`.
