Minor issues with docs

While I was working on automatic translation of PostgreSQL's
documentation from SGML to XML, I found some minor issues.

In the file doc/src/sgml/ecpg.sgml there are many lines of C code
containing unescaped '<' characters.

In the file doc/src/sgml/array.sgml there is a tag which has a case
mismatch error with its end tag.

Attached you can find the patch, if you want to apply it.

Regards,
Marco

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Marco Nenciarini - 2ndQuadrant Italy
PostgreSQL Training, Services and Support
marco.nenciarini@2ndQuadrant.it | www.2ndQuadrant.it