Wrapped long lines and put #[doc] in backquotes.

src/meta/doc.md

@@ -2,7 +2,8 @@
 
 Use `cargo doc` to build documentation in `target/doc`.
 
-Use `cargo test` to run all tests (including documentation tests), and `cargo test --doc` to only run documentation tests.
+Use `cargo test` to run all tests (including documentation tests), and `cargo
+test --doc` to only run documentation tests.
 
 These commands will appropriately invoke `rustdoc` (and `rustc`) as required.
 
@@ -67,7 +68,8 @@ $ rustdoc --test --extern doc="libdoc.rlib" doc.rs
 
 ## Doc attributes
 
-Below are a few examples of the most common `#[doc]` attributes used with `rustdoc`.
+Below are a few examples of the most common `#[doc]` attributes used with
+`rustdoc`.
 
 ### `inline`
 
@@ -104,7 +106,8 @@ Using this tells `rustdoc` not to include this in documentation:
 pub use self::async_await::*;
 ```
 
-For documentation, `rustdoc` is widely used by the community. It's what is used to generate the [std library docs](https://doc.rust-lang.org/std/).
+For documentation, `rustdoc` is widely used by the community. It's what is used
+to generate the [std library docs](https://doc.rust-lang.org/std/).
 
 ### See also:
 

src/meta/playground.md

@@ -1,6 +1,7 @@
 # Playground
 
-The [Rust Playground](https://play.rust-lang.org/) is a way to experiment with Rust code through a web interface.
+The [Rust Playground](https://play.rust-lang.org/) is a way to experiment with
+Rust code through a web interface.
 
 ## Using it with `mdbook`
 
@@ -12,15 +13,18 @@ fn main() {
 }
 ```
 
-This allows the reader to both run your code sample, but also modify and tweak it. The key here is the adding the word `editable` to your codefence block separated by a comma.
+This allows the reader to both run your code sample, but also modify and tweak
+it. The key here is the adding the word `editable` to your codefence block
+separated by a comma.
 
 ````markdown
 ```rust,editable
 //...place your code here
 ```
 ````
 
-Additionally, you can add `ignore` if you want `mdbook` to skip your code when it builds and tests.
+Additionally, you can add `ignore` if you want `mdbook` to skip your code when
+it builds and tests.
 
 ````markdown
 ```rust,editable,ignore
@@ -30,7 +34,10 @@ Additionally, you can add `ignore` if you want `mdbook` to skip your code when i
 
 ## Using it with docs
 
-You may have noticed in some of the [official Rust docs][official-rust-docs] a button that says "Run", which opens the code sample up in a new tab in Rust Playground. This feature is enabled if you use the #[doc] attribute called [`html_playground_url`][html-playground-url].
+You may have noticed in some of the [official Rust docs][official-rust-docs] a
+button that says "Run", which opens the code sample up in a new tab in Rust
+Playground. This feature is enabled if you use the `#[doc]` attribute called
+[`html_playground_url`][html-playground-url].
 
 ### See also: