Remove advertising clause from the code distributed from UCB

Follow ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

share/legal/COPYRIGHT

@@ -1,4 +1,4 @@
-#	$NetBSD: COPYRIGHT,v 1.2 2016/02/06 10:40:58 mlelstv Exp $
+#	$NetBSD: COPYRIGHT,v 1.3 2020/10/19 15:25:57 kamil Exp $
 #	@(#)COPYRIGHT	8.2 (Berkeley) 3/21/94
 
 All of the documentation and software included in the 4.4BSD and 4.4BSD-Lite
@@ -15,11 +15,7 @@ are met:
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
-3. All advertising materials mentioning features or use of this software
-   must display the following acknowledgement:
-This product includes software developed by the University of
-California, Berkeley and its contributors.
-4. Neither the name of the University nor the names of its contributors
+3. Neither the name of the University nor the names of its contributors
    may be used to endorse or promote products derived from this software
    without specific prior written permission.
 
@@ -128,4 +124,3 @@ Except as contained in this notice, the name of a copyright holder
 shall not be used in advertising or otherwise to promote the sale,
 use or other dealings in these Data Files or Software without prior
 written authorization of the copyright holder.
-