#352 Collection classes erratically documented as MapCollections

[Josep Maria Blasco]

The documentation for the Directory class says "A Directory is a MapCollection ..."
The documentation for the IdentityTable class says "An IdentityTable is a collection..."
The documentation for the Properties class says "A Properties object is a collection..."
The documentation for the Relation class says "A Relation is a collection..."
The documentation for the Stem class says "A Stem object is a collection..."
The documentation for the StringTable class says "A StringTable is a MapCollection ..."
The documentation for the Table class says "A Table is a collection..."

But according to 5.3.3. MapCollection Class, all of them are MapCollections. Documentation should be coherent in this respect (and the reference to MapCollection, when one is used, should be a clickable link).

[Josep Maria Blasco]

Here's a patch.

[Rony G. Flatscher]

Looks good, thank you very much, Josep Maria!

[Per Olov Jonsson]

Applied the patch without problems

[Josep Maria Blasco]

Thank you, P.O.!