Update books

Update reference, book, rust-by-example, edition-guide, embedded-book

## reference

15 commits in 41493ff..27ad493
2019-03-05 12:32:22 +0100 to 2019-03-26 02:06:15 +0100
- Document wasm_import_module for #[link]. (rust-lang/reference#554)
- Fix tidy error. (rust-lang/reference#552)
- Some minor contributing updates. (rust-lang/reference#551)
- Document `type_length_limit`. (rust-lang/reference#546)
- Add some terms to the glossary. (rust-lang/reference#547)
- Document `target_feature` and `cfg_target_feature`. (rust-lang/reference#545)
- Remove undocumented page (rust-lang/reference#539)
- Reorg and update attributes (rust-lang/reference#537)
- Fix some minor link errors. (rust-lang/reference#538)
- Add linkchecker. (rust-lang/reference#521)
- Expand docs on Macros By Example. (rust-lang/reference#511)
- document #[panic_handler] (rust-lang/reference#362)
- document #[used] (rust-lang/reference#361)
- Note that UB is program-global (rust-lang/reference#490)
- Fix copy-paste error in procedural-macros.md (rust-lang/reference#533)

## book

16 commits in 9cffbeabec3bcec42d09432bfe7705125c848889..b93ec30bbc7b1b5c2f44223249ab359bed2ed5a6
2019-03-02 08:22:41 -0500 to 2019-03-26 16:54:10 -0400
- Unignore example that now compiles
- Fix code snippet (rust-lang/book#1863)
- Fix mdbook link text in readme (rust-lang/book#1881)
- Wrap to 80 cols
- Make sentence more complete (rust-lang/book#1885)
- consistenly use increment and decrement (rust-lang/book#1884)
- Fix link to Reference's conditional-compilation. (rust-lang/book#1878)
- Fix subject/verb agreement
- Remove nostarch snapshot files that have been incorporated and checked
- haha teach the dictionary steve's name
- Add authorship info to the front page
- fix accidental <ol>'s (rust-lang/book#1866)
- Edits to Macros (rust-lang/book#1848)
- Mention `lock` returns `MutexGuard` wrapped in a `LockResult`
- Add an example that illustrates NLL (rust-lang/book#1842)
- change the parameter name from `type` to `kind` (rust-lang/book#1845)

## rust-by-example

33 commits in 2ce92beabb912d417a7314d6da83ac9b50dc2afb..f68ef3d0f4959f6a7d92a08d9994b117f0f4d32d
2018-11-20 10:10:23 -0500 to 2019-03-12 15:32:12 -0300
- Fix some broken links. (rust-lang/rust-by-example#1161)
- Update links in README (rust-lang/rust-by-example#1167)
- Add score/lifetimes/trait.md (rust-lang/rust-by-example#1168)
- Fix rust-lang/rust-by-example#1147 - No more `open_mode` method (rust-lang/rust-by-example#1164)
- Fix for loop description in list print example (rust-lang/rust-by-example#1162)
- Add link to Cargo chapter in the index page (rust-lang/rust-by-example#1159)
- Fix grammar in sentence about integer notation (rust-lang/rust-by-example#1157)
- Do not use deprecated functions from `std::error::Error` trait (rust-lang/rust-by-example#1151)
- Update new_types.md to clarify conversion to base type (rust-lang/rust-by-example#1148)
- Fix compatibility with Rust 2018 (rust-lang/rust-by-example#1150)
- Hello: Fix hint link in `fmt` chapter. (rust-lang/rust-by-example#1146)
- Clarify pub(restricted) example a bit (rust-lang/rust-by-example#1133)
- Add "literal" to list of macro designators (rust-lang/rust-by-example#1153)
- Minor fixes for the macros chapter (rust-lang/rust-by-example#1113)
- Use new book links instead of the old second-edition ones (rust-lang/rust-by-example#1143)
- Recommend implementing Display over ToString (rust-lang/rust-by-example#1145)
- Remove unused import and format with `rustfmt` (rust-lang/rust-by-example#1144)
- fix typo (rust-lang/rust-by-example#1142)
- Update syntax for 2018 Edition (rust-lang/rust-by-example#1136)
- Added two missing full stops (rust-lang/rust-by-example#1138)
- Removed unnecessary spaces before macro designators in macros/dry (rust-lang/rust-by-example#1139)
- fix install mdbook command (rust-lang/rust-by-example#1128)
- Changed word `function` to `type` in comment of fn area (rust-lang/rust-by-example#1132)
- Added two missing backticks in generics/multi_bounds (rust-lang/rust-by-example#1129)
- Fixed small logic error in error/option_unwrap/and_then (rust-lang/rust-by-example#1127)
- Fix typo (rust-lang/rust-by-example#1125)
- The code of conduct link was dead. I fixed it. (rust-lang/rust-by-example#1122)
- I added a space in the Display fmt for Complex (rust-lang/rust-by-example#1123)
- Fix Rust install link in the index (rust-lang/rust-by-example#1124)
- Update cargo conventions section (rust-lang/rust-by-example#1121)
- Fixed curly braces in the `To and from Strings` chapter to be parentheses (rust-lang/rust-by-example#1120)
- Edit a typo (rust-lang/rust-by-example#1119)
- Fixes rust-lang/rust-by-example#1115 by correcting the typo from into_iterator to into_iter (rust-lang/rust-by-example#1118)

## edition-guide

1 commits in aa0022c875907886cae8f3ef8e9ebf6e2a5e728d..b56ddb11548450a6df4edd1ed571b2bc304eb9e6
2019-02-27 22:10:39 -0800 to 2019-03-10 10:23:16 +0100
- Links fixes (rust-lang/edition-guide#133)

## embedded-book

6 commits in 9e656ead82bfe869493dec82653a52e27fa6a05c..07fd3880ea0874d82b1d9ed30ad3427ec98b4e8a
2019-03-03 16:03:26 +0000 to 2019-03-27 15:40:52 +0000
- Fix test errors.  (rust-embedded/book#180)
- Update qemu.md  (rust-embedded/book#170)
- Update no-std.md to remove obsolete FAQ link  (rust-embedded/book#177)
- We've come a long way :)  (rust-embedded/book#176)
- Correct link to team  (rust-embedded/book#175)
- Update some book links to their new homes.  (rust-embedded/book#173)