[eacsl] Fix category of past changelog entries

src/plugins/e-acsl/doc/Changelog

@@ -34,10 +34,10 @@ Plugin E-ACSL <next-release>
 -* E-ACSL       [2021-11-23] Add support for VDSO segment on Linux.
 -* e-acsl-gcc   [2021-11-22] Fix e-acsl-gcc.sh detection of failures in
                 subcommands.
--  E-ACSL       [2021-11-03] Improve runtime debug logs: the %a modifier now
+-  runtime      [2021-11-03] Improve runtime debug logs: the %a modifier now
                 outputs in hexadecimal, the debug logs now all end in new lines,
                 the trace now outputs to stderr.
--* E-ACSL       [2021-11-03] Fix default stack size: E_ACSL_STACK_SIZE
+-* runtime      [2021-11-03] Fix default stack size: E_ACSL_STACK_SIZE
                 is now correctly used by the runtime, the default values
                 have been adjusted to what was effectively used.
 -* E-ACSL       [2021-11-03] Now the same Frama-C options are used when parsing