fix: mnesia select/3,4 doc update

[MarkoMin]

In mnesia:select/3:

1. renamed Spec to MatchSpec (which is referenced from the doc section)

In mnesia:select/4:

1. renamed Spec to MatchSpec (which is referenced from the doc section)
2. renamed N to NObjects (which is referenced from the doc section)

TLDR: synchronization between variable names in specs and docs

[github-actions]

CT Test Results

  2 files   59 suites   18m 33s ⏱️
695 tests 544 ✅ 151 💤 0 ❌
750 runs  584 ✅ 166 💤 0 ❌

Results for commit f3353fd.

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// Erlang/OTP Github Action Bot

[Mikaka27]

Hi,

While you're at it would it be ok for you to fix other cases as well?
I see for example:

activity/4 (this one has also list of functions passed to AccessMod if it's used)
add_table_copy/3
add_table_index/3 (to be consistent with del_table_index which has a doc section)
backup_checkpoint/3
change_table_majority/2
create_schema/1
del_table_copy/2
del_table_index/2
delete_schema/1 (to be consistent with create_schema and doc section)
dirty_select/2 (to be consistent with your changes in select)
dirty_select_reverse/2 (same as above)
foldl/3 (to be consistent with foldl/4)
foldl/4
foldr/3 (to be consistent with foldr/4)
foldr/4
install_fallback/2
move_table_copy/3 (to be consistent with add_table_copy/3, and del_table_copy/3)
restore/2
select_reverse/3 (to be consistent with select/3)
select_reverse/4 (to be consistent with select/4)
set_master_nodes/1
set_master_nodes/2
snmp_open_table/2
subscribe/1
transform_table/3 (to be consistent with transform_table/4)
transform_table/4
traverse_backup/4 (to be consistent with traverse_backup/6)
traverse_backup/6
unsubscribe/1 (to be consistent with subscribe/1)
wait_for_tables/2