Update query chapter for the query macro rewrite

[rasendubi]

There was a big macro rewrite in these pull requests:
rust-lang/rust#56462
rust-lang/rust#59517

Update the query chapter to describe the new macro usage.

@Zoxc it would be nice if you could review this.

[rasendubi]

CI failure does not seem to be relevant:

There were 17 broken links:
traits/lowering-rules.md#31: "https://github.com/rust-lang-nursery/chalk/blob/master/src/rules.rs" returned 404 Not Found
traits/wf.md#14: "https://github.com/rust-lang-nursery/chalk/blob/master/src/rules/wf.rs" returned 404 Not Found
traits/wf.md#16: "https://github.com/rust-lang-nursery/chalk/blob/master/src/rules/wf/test.rs" returned 404 Not Found
traits/chalk-overview.md#84: "https://github.com/rust-lang/chalk/blob/master/src/rust_ir.rs" returned 404 Not Found
traits/chalk-overview.md#146: "https://github.com/rust-lang/chalk/blob/master/src/coherence.rs" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#38: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#41: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#59: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#70: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#72: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#80: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#89: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#98: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#101: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#115: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
borrow_check/moves_and_initialization/move_paths.md#117: "https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/move_paths/indexes/struct.MovePathIndex.html" returned 404 Not Found
appendix/background.md#79: There was an error while fetching "https://cs.au.dk/~amoeller/spa/", https://cs.au.dk/~amoeller/spa/: timed out
2019-04-15 22:08:28 [ERROR] (mdbook::renderer): Renderer exited with non-zero return code.
2019-04-15 22:08:28 [ERROR] (mdbook::utils): Error: Rendering failed
2019-04-15 22:08:28 [ERROR] (mdbook::utils): 	Caused By: The "linkcheck" renderer failed
The command "mdbook build" exited with 101.

[mark-i-m]

Thanks @rasendubi! I will take a look soon. It would also be great if @Zoxc could take a look, though, as I am not familiar with the changes.

[Zoxc]

The changes look good to me.

[mark-i-m]

Thanks!