Improve documentation of static_array_backend feature

Author: ZackPierce

README.md

@@ -110,6 +110,11 @@ static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
   runtime overhead. It is useful when debugging a use-after-free or `wee_alloc`
   itself.
 
+- **static_array_backend**: Force the use of an OS-independent fixed-size (16 MB)
+  backing implementation. Suitable for deploying to non-WASM/Unix/Windows
+  `#![no_std]` environments, such as on embedded devices with esoteric or effectively
+  absent operating systems.
+
 ### Implementation Notes and Constraints
 
 - `wee_alloc` imposes two words of overhead on each allocation for maintaining

wee_alloc/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
-categories = ["memory-management", "web-programming", "no-std", "wasm"]
+categories = ["memory-management", "web-programming", "no-std", "wasm", "embedded"]
 description = "wee_alloc: The Wasm-Enabled, Elfin Allocator"
 license = "MPL-2.0"
 name = "wee_alloc"
@@ -20,11 +20,12 @@ extra_assertions = []
 # Enable size classes for amortized *O(1)* small allocations.
 size_classes = []
 
+# Enable fixed-sized, OS-independent backing memory implementation
+static_array_backend = []
+
 # This is for internal use only.
 use_std_for_test_debugging = []
 
-static_array_backend = []
-
 [dependencies]
 memory_units = "0.4.0"
 cfg-if = "0.1.2"

wee_alloc/src/lib.rs

@@ -110,6 +110,11 @@ static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
   runtime overhead. It is useful when debugging a use-after-free or `wee_alloc`
   itself.
 
+- **static_array_backend**: Force the use of an OS-independent fixed-size (16 MB)
+  backing implementation. Suitable for deploying to non-WASM/Unix/Windows
+  `#![no_std]` environments, such as on embedded devices with esoteric or effectively
+  absent operating systems.
+
 ## Implementation Notes and Constraints
 
 - `wee_alloc` imposes two words of overhead on each allocation for maintaining