Rename cfg.attr.restriction

Author: ehuss

src/conditional-compilation.md

@@ -364,6 +364,8 @@ The syntax for the `cfg` attribute is:
 @root CfgAttribute -> `cfg` `(` ConfigurationPredicate `)`
 ```
 
+r[cfg.attr.allowed-positions]
+The `cfg` attribute is allowed anywhere attributes are allowed.
 
 r[cfg.attr.effect]
 If the predicate is true, the thing is rewritten to not have the `cfg` attribute on it. If the predicate is false, the thing is removed from the source code.
@@ -372,8 +374,6 @@ r[cfg.attr.crate-level-attrs]
 When a crate-level `cfg` has a false predicate, the behavior is slightly different: any crate attributes preceding the `cfg` are kept, and any crate attributes following the `cfg` are removed. This allows `#![no_std]` and `#![no_core]` crates to avoid linking `std`/`core` even if a `#![cfg(...)]` has removed the entire crate.
 
 
-r[cfg.attr.restriction]
-The `cfg` attribute is allowed anywhere attributes are allowed.
 
 r[cfg.cfg_attr]
 ### The `cfg_attr` attribute