ifcpatch: correct the AGS2IFC docstring example

The example block was copy pasted verbatim from ExtractPropertiesToSQLite,
so it named the wrong recipe and wrote a .sqlite file. These docstrings are
what ifcpatch surfaces as CLI and UI help, so anyone following the example
for AGS2IFC got a recipe name that does not match the one they selected.

Also state that the input file is not read and that a new IFC4X3 model is
built, since that is not obvious from the signature and the recipe creates
its own project rather than patching the one passed in.

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