Update FIXME message

Author: lauzadis

runtime/auth/http-auth-aws/common/test/aws/smithy/kotlin/runtime/http/auth/AwsHttpSignerTestBase.kt

@@ -147,7 +147,7 @@ public abstract class AwsHttpSignerTestBase(
         assertEquals(expectedSig, signed.headers["Authorization"])
     }
 
-    @IgnoreNative // FIXME Native signed request has additional `transfer-encoding` header
+    @IgnoreNative // FIXME Our JVM implementation does not sign `transfer-encoding`, but CRT does, causing a signature mismatch. Upgrade to latest version of aws-c-auth to get the fix.
     @Test
     public fun testSignAwsChunkedStreamNonReplayable(): TestResult = runTest {
         val op = buildOperation(streaming = true, replayable = false, requestBody = "a".repeat(AWS_CHUNKED_THRESHOLD + 1))
@@ -161,7 +161,7 @@ public abstract class AwsHttpSignerTestBase(
         assertEquals(expectedSig, signed.headers["Authorization"])
     }
 
-    @IgnoreNative // FIXME Native signed request has additional `transfer-encoding` header
+    @IgnoreNative // FIXME Our JVM implementation does not sign `transfer-encoding`, but CRT does, causing a signature mismatch. Upgrade to latest version of aws-c-auth to get the fix.
     @Test
     public fun testSignAwsChunkedStreamReplayable(): TestResult = runTest {
         val op = buildOperation(streaming = true, replayable = true, requestBody = "a".repeat(AWS_CHUNKED_THRESHOLD + 1))
@@ -175,7 +175,7 @@ public abstract class AwsHttpSignerTestBase(
         assertEquals(expectedSig, signed.headers["Authorization"])
     }
 
-    @IgnoreNative // FIXME Native signed request has additional `transfer-encoding` header
+    @IgnoreNative // FIXME Our JVM implementation does not sign `transfer-encoding`, but CRT does, causing a signature mismatch. Upgrade to latest version of aws-c-auth to get the fix.
     @Test
     public fun testSignOneShotStream(): TestResult = runTest {
         val op = buildOperation(streaming = true, replayable = false)