Change AUTHORS section in the man pages

The man pages no longer contain Graydon Hoare as the project lead.

Fix #13509.

Author: tbu-

man/rustc.1

@@ -182,8 +182,7 @@ rustdoc
 See <\fBhttps://github.com/mozilla/rust/issues\fR> for issues.
 
 .SH "AUTHOR"
-See \fBAUTHORS.txt\fR in the rust source distribution. Graydon Hoare
-<\fIgraydon@mozilla.com\fR> is the project leader.
+See \fBAUTHORS.txt\fR in the Rust source distribution.
 
 .SH "COPYRIGHT"
 This work is dual-licensed under Apache 2.0 and MIT terms.  See \fBCOPYRIGHT\fR

man/rustdoc.1

@@ -90,8 +90,7 @@ rustc
 See <\fBhttps://github.com/mozilla/rust/issues\fR> for issues.
 
 .SH "AUTHOR"
-See \fBAUTHORS.txt\fR in the rust source distribution. Graydon Hoare
-<\fIgraydon@mozilla.com\fR> is the project leader.
+See \fBAUTHORS.txt\fR in the Rust source distribution.
 
 .SH "COPYRIGHT"
 This work is dual-licensed under Apache 2.0 and MIT terms.  See \fBCOPYRIGHT\fR