Update collapse ring headers

ip/randsack/rtl/collapsering.v

diff --git a/ip/randsack/rtl/collapsering.v b/ip/randsack/rtl/collapsering.v
index 2de645f..04ce4c9 100644
--- a/ip/randsack/rtl/collapsering.v
+++ b/ip/randsack/rtl/collapsering.v
@@ -1,4 +1,7 @@
-// SPDX-FileCopyrightText: 2021 Harrison Pham
+// Trimmable collapsing ring oscillator for TRNG.
+//
+// SPDX-FileCopyrightText: (c) 2021 Harrison Pham <harrison@harrisonpham.com>
+// SPDX-License-Identifier: Apache-2.0
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +14,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-// SPDX-License-Identifier: Apache-2.0
 
 module collapsering (
   output wire CLKBUFOUT,

ip/randsack/rtl/collapsering_macro.v

diff --git a/ip/randsack/rtl/collapsering_macro.v b/ip/randsack/rtl/collapsering_macro.v
index d40bf17..6da1ce4 100644
--- a/ip/randsack/rtl/collapsering_macro.v
+++ b/ip/randsack/rtl/collapsering_macro.v
@@ -37,4 +37,4 @@
     .CLKMUX(clkmux)
   );
 
-endmodule  // collapsering_macro
+endmodule // module collapsering_macro