Rollup merge of #48274 - GuillaumeGomez:remove-hoedown, r=QuietMisdreavus

Remove hoedown from rustdoc Finally the time has come! r? @QuietMisdreavus

Author: GuillaumeGomez

.gitmodules

@@ -2,10 +2,6 @@
 path = src/llvm
 url = https://github.com/rust-lang/llvm.git
 branch = master
-[submodule "src/rt/hoedown"]
-path = src/rt/hoedown
-url = https://github.com/rust-lang/hoedown.git
-branch = rust-2015-09-21-do-not-delete
 [submodule "src/jemalloc"]
 path = src/jemalloc
 url = https://github.com/rust-lang/jemalloc.git

COPYRIGHT

@@ -192,28 +192,6 @@ their own copyright notices and license terms:
  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  OF SUCH DAMAGE.
 
-* Hoedown, the markdown parser, under src/rt/hoedown, is
- licensed as follows.
-
- Copyright (c) 2008, Natacha Porté
- Copyright (c) 2011, Vicent Martí
- Copyright (c) 2013, Devin Torres and the Hoedown authors
-
- Permission to use, copy, modify, and distribute this
- software for any purpose with or without fee is hereby
- granted, provided that the above copyright notice and
- this permission notice appear in all copies.
-
- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR
- DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
- INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
- FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR
- ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
- OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
 * libbacktrace, under src/libbacktrace:
 
  Copyright (C) 2012-2014 Free Software Foundation, Inc.