Fix mnesia doc after new doc system

[dgud]

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CT Test Results

  2 files   55 suites   19m 8s ⏱️
675 tests 528 ✅ 147 💤 0 ❌
728 runs  567 ✅ 161 💤 0 ❌

Results for commit 67723b5.

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[IngelaAndin]

@dgud I think your changes are enhancements. My comments are mainly for what you did not change.

This description "A distributed telecommunications DBMS" feels strange, should we not have a more general description.
as maybe a "key-value DBMS", this formulation kind of suggest that it is only useful for telecommunications! I also think we should explain the abbreviation at least once.

I think it looks strange in the summary that the types does not have any explanation. Some types are fairly self explaining, but some place it could be quite helpful to understand when these are applicable. However, looking at current state of the documentation elsewhere I can not find a consistent way of having or not having an explanation.