[bug#76995] [PATCH] Fix pasteo in automake.texi

Hello.

This fixes a copy-paste mistake in the Algol 68 section of the manual.
Thanks!

diff --git a/doc/automake.texi b/doc/automake.texi
index 5cdf91f68..0c13d7146 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -7193,7 +7193,7 @@ Any package including Algol 68 code must define the output variable
 the @code{AC_PROG_A68} macro (@pxref{Particular Programs, , Particular
 Program Checks, autoconf, The Autoconf Manual}).
 
-A few additional variables are defined when a Fortran 77 source file is
+A few additional variables are defined when an Algol 68 source file is
 seen:
 
 @vtable @code