Copy description from Cargo.toml to METADATA am: 7ca0635669

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rustc-hash/+/1456779

Change-Id: If33bcab6820a4f161ddd2a5d1564e74542c04086
diff --git a/METADATA b/METADATA
index 856b409..6f1612e 100644
--- a/METADATA
+++ b/METADATA
@@ -1,5 +1,5 @@
 name: "rustc-hash"
-description: "A speedy hash algorithm used within rustc. The hashmap in liballoc by default uses SipHash which isn\'t quite as speedy as we want. In the compiler we\'re not really worried about DOS attempts, so we use a fast non-cryptographic hash."
+description: "speed, non-cryptographic hash used in rustc"
 third_party {
   url {
     type: HOMEPAGE