gitattributes: fix eol attribute for Perl scripts

The *.pl pattern currently sets eof=lf, which is not a built-in
attribute used for line-ending normalization.

Use eol=lf instead, matching the neighboring *.perl and *.pm rules, so
Perl scripts are checked out with LF line endings.

Signed-off-by: Koutian Wu <ktwu01@gmail.com>

Author: ktwu01

.gitattributes

@@ -2,7 +2,7 @@
 *.[ch] whitespace=indent,trail,space,incomplete diff=cpp
 *.sh whitespace=indent,trail,space,incomplete text eol=lf
 *.perl text eol=lf diff=perl
-*.pl text eof=lf diff=perl
+*.pl text eol=lf diff=perl
 *.pm text eol=lf diff=perl
 *.py text eol=lf diff=python
 *.bat text eol=crlf