Federico Rinaldi 615d43b998 Improve bevy_ecs and bevy_app API docs where referenced by the new Bevy Book (#2365) ... ## Objective The upcoming Bevy Book makes many references to the API documentation of bevy. Most references belong to the first two chapters of the Bevy Book: - bevyengine/bevy-website#176 - bevyengine/bevy-website#182 This PR attempts to improve the documentation of `bevy_ecs` and `bevy_app` in order to help readers of the Book who want to delve deeper into technical details. ## Solution - Add crate and level module documentation - Document the most important items (basically those included in the preludes), with the following style, where applicable: - **Summary.** Short description of the item. - **Second paragraph.** Detailed description of the item, without going too much in the implementation. - **Code example(s).** - **Safety or panic notes.** ## Collaboration Any kind of collaboration is welcome, especially corrections, wording, new ideas and guidelines on where the focus should be put in. --- ### Related issues - Fixes #2246		2021-09-17 18:00:29 +00:00
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src	Improve bevy_ecs and bevy_app API docs where referenced by the new Bevy Book (#2365)	2021-09-17 18:00:29 +00:00
Cargo.toml	Not me ... us (#2654)	2021-08-15 20:08:52 +00:00