Update error.yaml comment to remove Perl reference.
# Error Definitions
#
-# Master file for all errors in the C and Perl code. For C, errors are written to src/common/error.auto.c/h. For Perl, errors are
-# written to lib/pgBackRest/Common/ExceptionAuto.pm.
+# Definitions for all C errors, auto-generated to src/common/error.auto.c/h.
# Errors in the code that it should not be possible for the user to encounter -- i.e., a likely bug
assert: 25
