In v13, the id for max_parallel_maintenance_workers is defined differently
as compared to HEAD in docs, so adjust the docs accordingly.
Reported-by: Magnus Hagander and Tom Lane
Discussion: https://postgr.es/m/CABUevEyAFQZ_jvjY_KtRUWbci4YMyQC1QAMzDQAbLs=XCo3m5Q@mail.gmail.com
to perform the operation is equal to the number of indexes on the
relation that support parallel vacuum which is limited by the number of
workers specified with <literal>PARALLEL</literal> option if any which is
- further limited by <xref linkend="guc-max-parallel-maintenance-workers"/>.
+ further limited by <xref linkend="guc-max-parallel-workers-maintenance"/>.
An index can participate in parallel vacuum if and only if the size of the
index is more than <xref linkend="guc-min-parallel-index-scan-size"/>.
Please note that it is not guaranteed that the number of parallel workers