fix a typo in third_party/fiat/METADATA

Change-Id: I91626b4e84f4a6b53be94d5e4823c634b6e7a5a1
Reviewed-on: https://boringssl-review.googlesource.com/22684
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/third_party/fiat/METADATA b/third_party/fiat/METADATA
index bae0285..2d6242d 100644
--- a/third_party/fiat/METADATA
+++ b/third_party/fiat/METADATA
@@ -1,6 +1,6 @@
 name: "fiat"
 description:
-    "Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives".
+    "Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives."
 
 third_party {
   url {