Merge #4660

4660: Enable hover and autocomplete docs on macro generated items r=aloucks a=aloucks

Enable hover and autocomplete docs on macro generated items. This de-sugars doc comments into `doc` attributes in some cases, but not all. Comments and `doc` attributes are then merged together. 

This PR is essentially a partial implementation of what's being suggested #3182, but it's not all the way there yet. ~I still need to add unit tests~, but I wanted to first get feedback on whether or not this was an acceptable path forward.

Fixes #4564
Fixes #3984
Fixes #3180
Related #3182

![macro_item_docs](https://user-images.githubusercontent.com/221559/83336760-15012200-a284-11ea-8d0d-b6a615850044.gif)



Co-authored-by: Aaron Loucks <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/user/generated_features.adoc b/docs/user/generated_features.adoc
index 12812fa0b..4b93b759f 100644
--- a/docs/user/generated_features.adoc
+++ b/docs/user/generated_features.adoc
@@ -76,7 +76,7 @@ Navigates to the type of an identifier.
 
 
 === Hover
-**Source:** https://github.com/rust-analyzer/rust-analyzer/blob/master/crates/ra_ide/src/hover.rs#L63[hover.rs]
+**Source:** https://github.com/rust-analyzer/rust-analyzer/blob/master/crates/ra_ide/src/hover.rs#L58[hover.rs]
 
 Shows additional information, like type of an expression or documentation for definition when "focusing" code.
 Focusing is usually hovering with a mouse, but can also be triggered with a shortcut.